MILLER, Chief Justice:
In this appeal from a final order of the Circuit Court of Ohio County dated December 19, 1988, we are asked to determine whether the circuit court was correct in restricting informational picketing on private property. We conclude that jurisdiction of the case was preempted by federal law, and we reverse the judgment of the circuit court.
Riesbeck Food Markets, Inc. (Riesbeck) is an Ohio corporation which operates a supermarket in the Elm Grove Crossing shopping center in Wheeling. Riesbeck leases the premises from Elm Grove Properties (Elm Grove), a general partnership which owns the shopping center. United Food and Commercial Workers, Local Union 23 (Union), is an unincorporated labor association with offices in Pittsburgh, Pennsylvania, which represents employees of other retail grocery stores in northern West Virginia.
On September 7, 1988, the Union established an informational picket line outside the customer entrances to the Riesbeck store. The pickets carried placards which identified Riesbeck as a nonunion employer and asked the public not to patronize the market.1 In addition, the pickets passed out handbills which elaborated on the nonunion theme and urged customers to shop only at Union stores.2 The store manager asked the pickets to leave the premises, but they refused. The Union apparently made no attempt to organize Riesbeck employ[14]*14ees, and none of the pickets were employed by Riesbeck.
On September 9, 1988, Riesbeck and Elm Grove filed a complaint in the Circuit Court of Ohio County seeking to enjoin the Union from picketing and handbilling upon their private property. The circuit court issued a temporary restraining order, effectively forcing the Union to move its activities to the public areas at the entrances to the shopping center.3 Hearings on the issuance of a permanent injunction were set for October 14, 1988, and November 8, 1988.
On September 19, 1988, the Union filed an unfair labor practice charge against Ri-esbeck with the National Labor Relations Board (NLRB). The Union asserted that Riesbeck’s attempts to remove the pickets from the shopping center premises interfered with the rights of employees secured by the National Labor Relations Act (the Act), 29 U.S.C. §§ 151-169 (1988). The NLRB Regional Director subsequently issued a complaint which referred the matter to an administrative law judge for hearing.4 At the permanent injunction hearings before the circuit court, the Union argued that the NLRB had exclusive jurisdiction of the case.
By order dated December 19, 1988, the circuit court issued a permanent injunction against the Union. The court ruled that the matters at issue in the state court proceedings were not preempted by federal labor law and ordered picketing and hand-billing removed to the public areas at the shopping center entrances.
On appeal, the Union’s principal contention is that the circuit court’s jurisdiction over the case was preempted by provisions of the Act. The Union contends that its peaceful informational picketing of the Ri-esbeck store was protected by Section 7 of the Act, 29 U.S.C. § 157, which enumerates the rights of employees.5 In addition, the Union asserts that Riesbeck’s demand that the pickets leave the shopping center premises constituted an interference with their Section 7 rights, an unfair labor practice under Section 8 of the Act, 29 U.S.C. § 158.6
The general rule is that state courts must defer to the primary and exclusive jurisdiction of the NLRB to determine all controversies arising out of activities protected by Section 7 or prohibited by Section 8 of the Act. See, e.g., San Diego Bldg. Trades Council v. Garmon, 359 U.S. 236, 79 S.Ct. 773, 3 L.Ed.2d 775 (1959); United Maintenance & Mfg. Co. v. United Steelworkers, 157 W.Va. 788, 204 S.E.2d 76 (1974); McJunkin Corp. v. Bell Lines, Inc., 144 W.Va. 330, 108 S.E.2d 12 (1959). See generally 48A Am.Jur.2d Labor & Labor Relations § 2003 (1979); 51A C.J.S. Labor Relations §§ 524, 525 (1967); Annot., 75 L.Ed.2d 988 (1985); Annot., 38 L.Ed.2d 796 (1974). The reason for this exclusivity is to ensure a uniform national labor policy by avoiding the conflicting or incompatible adjudications that would inevitably result from “[a] multiplicity of tribunals and a diversity of procedures.” Garner v. Teamsters, Chauffeurs & Helpers Local Union No. 776, 346 U.S. 485, 490-91, [15]*1574 S.Ct. 161, 166, 98 L.Ed. 228, 239-40 (1953). See also International Longshoremen’s Ass’n v. Davis, 476 U.S. 380, 106 S.Ct. 1904, 90 L.Ed.2d 389 (1986); New York Tel. Co. v. New York State Dep’t of Labor, 440 U.S. 519, 99 S.Ct. 1328, 59 L.Ed.2d 553 (1979); Amalgamated Ass’n of Street, Elec. Ry. & Motor Coach Employees v. Lockridge, 403 U.S. 274, 91 S.Ct. 1909, 29 L.Ed.2d 473 (1971).
Guidelines for determining whether labor activity is governed by the Act were set out in San Diego Building Trades Council v. Garmon, supra. In Garmon, nonemployee union members picketed the employer’s place of business, allegedly in an effort to compel the employer to execute a contract to hire only union members. The employer7 filed an unfair labor practice charge with the NLRB and instituted an action for an injunction in state court. The union contested the state court’s power to issue an injunction.
The Court in Garmon held that where activities are clearly governed by the Act, the NLRB has primary jurisdiction of the case, and state court jurisdiction is preempted.8 The Court also noted, however, that it is not always clear whether a particular activity is protected by Section 7 or prohibited by Section 8 of the Act. State courts are entitled to retain jurisdiction “where the activity regulated was a merely peripheral concern of the ... Act” or “where the regulated conduct touched interests so deeply rooted in local feeling and responsibility that, in the absence of compelling congressional direction, we could not infer that Congress had deprived the States of the power to act.”9 359 U.S. at 243-44, 79 S.Ct. at 779, 3 L.Ed.2d at 782. (Footnote omitted). Noting that “courts are not primary tribunals to adjudicate such issues,” the Supreme Court concluded: “[W]hen an activity is arguably subject to § 7 or § 8 of the Act, the States as well as the federal courts must defer to the exclusive competence of the National Labor Relations Board if the danger of state interference with national policy is to be averted.” 359 U.S. at 244, 245, 79 S.Ct. at 779, 780, 3 L.Ed.2d at 783. (Emphasis added). See United Maintenance & Mfg. Co. v.
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MILLER, Chief Justice:
In this appeal from a final order of the Circuit Court of Ohio County dated December 19, 1988, we are asked to determine whether the circuit court was correct in restricting informational picketing on private property. We conclude that jurisdiction of the case was preempted by federal law, and we reverse the judgment of the circuit court.
Riesbeck Food Markets, Inc. (Riesbeck) is an Ohio corporation which operates a supermarket in the Elm Grove Crossing shopping center in Wheeling. Riesbeck leases the premises from Elm Grove Properties (Elm Grove), a general partnership which owns the shopping center. United Food and Commercial Workers, Local Union 23 (Union), is an unincorporated labor association with offices in Pittsburgh, Pennsylvania, which represents employees of other retail grocery stores in northern West Virginia.
On September 7, 1988, the Union established an informational picket line outside the customer entrances to the Riesbeck store. The pickets carried placards which identified Riesbeck as a nonunion employer and asked the public not to patronize the market.1 In addition, the pickets passed out handbills which elaborated on the nonunion theme and urged customers to shop only at Union stores.2 The store manager asked the pickets to leave the premises, but they refused. The Union apparently made no attempt to organize Riesbeck employ[14]*14ees, and none of the pickets were employed by Riesbeck.
On September 9, 1988, Riesbeck and Elm Grove filed a complaint in the Circuit Court of Ohio County seeking to enjoin the Union from picketing and handbilling upon their private property. The circuit court issued a temporary restraining order, effectively forcing the Union to move its activities to the public areas at the entrances to the shopping center.3 Hearings on the issuance of a permanent injunction were set for October 14, 1988, and November 8, 1988.
On September 19, 1988, the Union filed an unfair labor practice charge against Ri-esbeck with the National Labor Relations Board (NLRB). The Union asserted that Riesbeck’s attempts to remove the pickets from the shopping center premises interfered with the rights of employees secured by the National Labor Relations Act (the Act), 29 U.S.C. §§ 151-169 (1988). The NLRB Regional Director subsequently issued a complaint which referred the matter to an administrative law judge for hearing.4 At the permanent injunction hearings before the circuit court, the Union argued that the NLRB had exclusive jurisdiction of the case.
By order dated December 19, 1988, the circuit court issued a permanent injunction against the Union. The court ruled that the matters at issue in the state court proceedings were not preempted by federal labor law and ordered picketing and hand-billing removed to the public areas at the shopping center entrances.
On appeal, the Union’s principal contention is that the circuit court’s jurisdiction over the case was preempted by provisions of the Act. The Union contends that its peaceful informational picketing of the Ri-esbeck store was protected by Section 7 of the Act, 29 U.S.C. § 157, which enumerates the rights of employees.5 In addition, the Union asserts that Riesbeck’s demand that the pickets leave the shopping center premises constituted an interference with their Section 7 rights, an unfair labor practice under Section 8 of the Act, 29 U.S.C. § 158.6
The general rule is that state courts must defer to the primary and exclusive jurisdiction of the NLRB to determine all controversies arising out of activities protected by Section 7 or prohibited by Section 8 of the Act. See, e.g., San Diego Bldg. Trades Council v. Garmon, 359 U.S. 236, 79 S.Ct. 773, 3 L.Ed.2d 775 (1959); United Maintenance & Mfg. Co. v. United Steelworkers, 157 W.Va. 788, 204 S.E.2d 76 (1974); McJunkin Corp. v. Bell Lines, Inc., 144 W.Va. 330, 108 S.E.2d 12 (1959). See generally 48A Am.Jur.2d Labor & Labor Relations § 2003 (1979); 51A C.J.S. Labor Relations §§ 524, 525 (1967); Annot., 75 L.Ed.2d 988 (1985); Annot., 38 L.Ed.2d 796 (1974). The reason for this exclusivity is to ensure a uniform national labor policy by avoiding the conflicting or incompatible adjudications that would inevitably result from “[a] multiplicity of tribunals and a diversity of procedures.” Garner v. Teamsters, Chauffeurs & Helpers Local Union No. 776, 346 U.S. 485, 490-91, [15]*1574 S.Ct. 161, 166, 98 L.Ed. 228, 239-40 (1953). See also International Longshoremen’s Ass’n v. Davis, 476 U.S. 380, 106 S.Ct. 1904, 90 L.Ed.2d 389 (1986); New York Tel. Co. v. New York State Dep’t of Labor, 440 U.S. 519, 99 S.Ct. 1328, 59 L.Ed.2d 553 (1979); Amalgamated Ass’n of Street, Elec. Ry. & Motor Coach Employees v. Lockridge, 403 U.S. 274, 91 S.Ct. 1909, 29 L.Ed.2d 473 (1971).
Guidelines for determining whether labor activity is governed by the Act were set out in San Diego Building Trades Council v. Garmon, supra. In Garmon, nonemployee union members picketed the employer’s place of business, allegedly in an effort to compel the employer to execute a contract to hire only union members. The employer7 filed an unfair labor practice charge with the NLRB and instituted an action for an injunction in state court. The union contested the state court’s power to issue an injunction.
The Court in Garmon held that where activities are clearly governed by the Act, the NLRB has primary jurisdiction of the case, and state court jurisdiction is preempted.8 The Court also noted, however, that it is not always clear whether a particular activity is protected by Section 7 or prohibited by Section 8 of the Act. State courts are entitled to retain jurisdiction “where the activity regulated was a merely peripheral concern of the ... Act” or “where the regulated conduct touched interests so deeply rooted in local feeling and responsibility that, in the absence of compelling congressional direction, we could not infer that Congress had deprived the States of the power to act.”9 359 U.S. at 243-44, 79 S.Ct. at 779, 3 L.Ed.2d at 782. (Footnote omitted). Noting that “courts are not primary tribunals to adjudicate such issues,” the Supreme Court concluded: “[W]hen an activity is arguably subject to § 7 or § 8 of the Act, the States as well as the federal courts must defer to the exclusive competence of the National Labor Relations Board if the danger of state interference with national policy is to be averted.” 359 U.S. at 244, 245, 79 S.Ct. at 779, 780, 3 L.Ed.2d at 783. (Emphasis added). See United Maintenance & Mfg. Co. v. United Steelworkers, supra; McJunkin Corp. v. Bell Lines, Inc., supra. See generally 51A C.J.S. Labor Relations § 525.
It is undisputed that peaceful informational picketing of the type involved here is a protected activity under Section 7 of the Act. See Sears, Roebuck & Co. v. San Diego Dist. Council of Carpenters, 436 U.S. 180, 98 S.Ct. 1745, 56 L.Ed.2d 209 (1978); International Longshoremen’s Local 1416 v. Ariadne Shipping Co., 397 U.S. 195, 90 S.Ct. 872, 25 L.Ed.2d 218 (1970); [16]*16Giant Food Mkts. v. NLRB, 633 F.2d 18 (6th Cir.1980). The same rule has been applied to union handbilling. See Eastex, Inc. v. NLRB, 437 U.S. 556, 98 S.Ct. 2505, 57 L.Ed.2d 428 (1978); Republic Aviation Corp. v. NLRB, 324 U.S. 793, 65 S.Ct. 982, 89 L.Ed. 1372 (1945); Sentry Mkts., Inc. v. NLRB, 914 F.2d 113 (7th Cir.1990).
It has also been recognized that in certain circumstances a trespass upon the employer’s private property may be protected. In NLRB v. Babcock & Wilcox Co., 351 U.S. 105, 76 S.Ct. 679, 100 L.Ed. 975 (1956), for example, employers refused to permit nonemployee union organizers to distribute union literature on company-owned parking lots. Unfair labor practice charges were filed against the employers, whom the NLRB found to have unlawfully denied the organizers access to their private property. On appeal, the Supreme Court upheld the NLRB, concluding that the employee’s right to receive organizational material under Section 7 must be balanced against the employer’s right to control the use of its property to reach an “[accommodation between the two ... with as little destruction of one as is consistent with the maintenance of the other.”10 351 U.S. at 112, 76 S.Ct. at 684, 100 L.Ed. at 982-83. The Court ruled that where there was no alternative means by which the union’s message could be transmitted to its intended audience, the organizers' trespassory handbill-ing was a protected activity which super-ceded the employers’ private property rights. See generally 48 Am.Jur.2d Labor & Labor Relations § 875 (1979).
In Hudgens v. NLRB, 424 U.S. 507, 96 S.Ct. 1029, 47 L.Ed.2d 196 (1976), the Supreme Court applied these principles to a strike in which warehouse employees peacefully picketed their employer’s retail store at an enclosed shopping mall. After an agent of the mall owner threatened the pickets with arrest for trespassing if they did not leave the mall, the union filed an unfair labor practice charge against the mall owner. The Supreme Court concluded that the principles of accommodation enunciated in Babcock controlled,11 but stated that “[t]he locus of that accommodation, however, may fall at differing points along the spectrum depending on the nature and strength of the respective § 7 rights and private property rights asserted in any given context.” 424 U.S. at 522, 96 S.Ct. at 1038, 47 L.Ed.2d at 208-09. The Court went on to state that “[i]n each generic situation, the primary responsibility for making this accommodation must rest with the Board in the first instance.” 424 U.S. at 522, 96 S.Ct. at 1038, 47 L.Ed.2d at 209.
The Union argues that the Babcock accommodation principles are applicable in this case12 and that the circuit court should [17]*17have deferred to the jurisdiction of the NLRB. On the other hand, the plaintiffs below do not challenge the Union’s right to picket and handbill, but only its right to conduct such activity on their private property. The plaintiffs assert that trespass is one of those activities so deeply rooted in local feeling and responsibility that it falls outside the ambit of the Act and is a proper matter for adjudication by state courts.
In support of their position, the plaintiffs rely on Sears, Roebuck & Co. v. San Diego , County District Council of Carpenters, supra. In Sears, nonemployee union members set up a picket line on the property of a Sears department store to advise the public that the store had hired nonunion carpenters.. A Sears employee asked , the pickets to leave, but they refused. Sears , instituted a trespass action in state court' and subsequently obtained an injunction preventing the union from picketing on store property. The union asserted that the state courts had no jurisdiction to enjoin the picketing because it was arguably protected under the Act. Significantly, the union did not file an unfair labor practice, charge with the NLRB.
The Supreme Court started with the proposition that the standards for judging whether the picketing was arguably protected or arguably prohibited are not to be applied in a rigid or inflexible manner.
“While the Garmon formulation accurately reflects the basic federal concern with potential state interference with national labor policy, the history of the labor, pre-emption doctrine in this Court does not support an approach which sweeps away state-court jurisdiction over conduct traditionally subject to state regulation without careful consideration of the relative impact of such a jurisdictional bar on the various interests affected.” 436 U.S. at 188, 98 S.Ct. at 1752-53, 56 L.Ed.2d at 219-20. (Footnote omitted).
"The fact that Sears demanded that the Union discontinue the trespass before it initiated the trespass action is critical to our holding. While it appears that such a demand was a precondition to commencing a trespass action under California law, see [Sears, Roebuck & Co. v. San Diego County District Council, 49 Cal.App.3d 232] 122 Cal.Rptr. 449 (1975), in order to avoid a valid claim of pre-emption, it
The Supreme Court recognized a two-pronged inquiry for application of the Gar-mon principles in circumstances where the activity is not clearly subject to the Act. The first inquiry is whether the activity is arguably prohibited under Section 8. In this situation, the existence of “a significant state interest protecting the citizen from the challenged conduct” is important. 436 U.S. at 196, 98 S.Ct. at 1757, 56 L.Ed.2d at 225. However, “[t]he critical inquiry ... is ... whether the controversy presented to the state court is identical to ... or different from ... that which could have been, but was not, presented to the Labor Board.” 436 U.S. at 197, 98 S.Ct. at 1757, 56 L.Ed.2d at 225. The Court concluded in Sears that the issue which would have been presented to the NLRB was whether the picketing had been proscribed by Section 8. This was unrelated to the state claim of trespass, which challenged only the location of the picketing. Consequently, the issues being distinct, there was no realistic risk of interference with the NLRB’s primary jurisdiction which would warrant pre-emption of state court jurisdiction over the trespass action.
With respect to the second prong of the inquiry, the Supreme Court was willing to concede that the union’s trespassory picketing was arguably protected under Section 7 of the Act. The Court concluded, however, that this fact alone was not sufficient to warrant preemption of state court jurisdiction in all cases: “The primary-jurisdiction rationale justifies pre-emption only in situations in which an aggrieved party has a reasonable opportunity either to invoke the Board’s jurisdiction himself or else to induce his adversary to do so.” 436 U.S. at 201, 98 S.Ct. at 1759, 56 L.Ed.2d at 228. The Court held that the union’s failure to file with the NLRB an unfair labor practice charge challenging Sears’ demand that the pickets leave its property13 left the employ[18]*18er with no forum for an orderly resolution of the issue except in state court. 436 U.S. at 201-02, 98 S.Ct. at 1759-69, 56 L.Ed.2d at 228-29. The Court concluded that the primary jurisdiction rationale was relatively unimportant when compared with the employer’s interest in having an opportunity to litigate whether the picketing was, in fact, protected and held that preemption of the state court’s jurisdiction was not warranted solely on the ground that the activity was arguably protected.
The majority in Sears did not specifically decide whether the state court’s jurisdiction of the trespass claim would have been preempted if, as in the case before us, the union had filed an unfair labor practice charge with the NLRB.14 The majority opinion, however, made a definite suggestion that the state court’s jurisdiction would be preempted in such circumstances: “As long as the union has a fair opportunity to present the protection issue to the Labor Board, it retains meaningful protection against the risk of error in a state tribunal. In this case the Union failed to invoke the jurisdiction of the Labor Board[.]” 15 436 U.S. at 207, 98 S.Ct. at 1762, 56 L.Ed.2d at 231. (Footnote omitted).
Other courts which have reached the issue have concluded that the filing of an unfair labor practice charge with the NLRB preempts state court jurisdiction to enjoin trespassory labor activity in the absence of other factors such as mass picketing or violence. See Shirley v. Retail Store Employees Union, 225 Kan. 470, 592 P.2d 433 (1979) (trespassory employee picketing); Cross Country Inn, Inc. v. South Cent. Dist. Council, United Bhd. of Carpenters & Joiners of Am., 50 Ohio App.3d 8, 552 N.E.2d 232 (1989) (trespassory non-employee handbilling); Wiggins & Co., Inc. v. Retail Clerks Union Local No. 1557, 595 S.W.2d 802 (Tenn.1980) (trespassory nonemployee picketing). Contra Weis Mkts. Inc. v. United Food & Commercial Workers Union, Local 400, 85 Md.App. 284, 583 A.2d 1092 (1991); Smitty’s Super Mkts., Inc. v. Retail Store Employees Local 322, 637 S.W.2d 148 (Mo.App.1982). See generally Annot., 56 L.Ed.2d 813 (1979). As the Supreme Court of Kansas stated in Syllabus Point 3 of Shirley, supra:
“If a union, after receiving from the employer or property owner a notice to cease trespassory picketing, files a complaint with the NLRB and the board takes jurisdiction, a Kansas district court has the power to enjoin trespassory picketing only where there is shown to be actual violence or a threat of immediate violence or some obstruction to the free use of property by the public that immediately threatens public health or safety or that denies to an employer or his customers reasonable ingress or egress to and from the employer’s place of business.”
We must agree with this interpretation. There is certainly precedent for the conclusion that the labor activities the Union engaged in here were arguably protected under Section 7. In Sears, for example, the Court stated: “Since it cannot be said with certainty that, if the Union had filed an unfair labor practice charge against Sears, the Board would have fixed the locus of the accommodation at the unprotected end of the spectrum, it is indeed ‘arguable’ that the Union’s peaceful picketing, though tres-passory, was protected.” 436 U.S. at 205, 98 S.Ct. at 1761, 56 L.Ed.2d at 230. See [19]*19also Jean Country, 291 N.L.R.B. No. 4, 129 L.R.R.M. 1201 (Sept. 27, -1988). See generally 51A C.J.S. Labor Relations § 527. Moreover, by issuing the complaint against Riesbeck, the NLRB has already exercised some degree of jurisdiction over the Union’s claim.
Accordingly, we conclude that peaceful informational picketing by a union may be arguably protected by Section 7 of the Act, even though it occurs on private property, if the union files an unfair labor practice charge against the parties seeking to prevent such activity. The NLRB had primary jurisdiction of the dispute between Riesbeck and the Union, and the circuit court should have deferred to such jurisdiction once the Union filed the unfair labor practice charge.
Elm Grove asserts that our conclusions with respect to Riesbeck should not prevent the circuit court from issuing an injunction on its behalf. Elm Grove notes that the unfair labor practice charge did not name it as a party and argues that under the decision in Sears, the Union cannot challenge Elm Grove’s right to an injunction in state court.
We believe Elm Grove misreads the Sears opinion. To avoid even a potential conflict between state courts and the NLRB, the primary jurisdiction rationale provides, in effect, for a presumption in favor of preemption when the conduct in question is arguably protected under the Act. Brown v. Hotel & Restaurant Employees & Bartenders Int’l Union Local 5b, 468 U.S. 491, 104 S.Ct. 3179, 82 L.Ed.2d 373 (1984). See Belknap, Inc. v. Hale, 463 U.S. 491, 103 S.Ct. 3172, 77 L.Ed.2d 798 (1983). In Sears, the Supreme Court simply refused to give the union the benefit of this presumption where it had deprived the employer of the opportunity , to litigate the issue administratively by failing to file an unfair labor practice charge with the NLRB.
Unlike the property owner in Sears, Elm Grove was not necessarily excluded from litigating the protected character of the Union’s activities before the NLRB. Under Section 10(b) of the Act, 29 U.S.C. § 160(b), any person other than a party may intervene in an administrative proceeding involving an unfair labor practice charge at the discretion of the NLRB or of the hearing officer or agency.16 See J.P. Stevens Employees Educ. Comm. v. NLRB, 582 F.2d 326 (4th Cir.1978); International Union, United Auto., Aerospace & Agric. Implement Workers, 129 U.S. App.D.C. 196, 392 F.2d 801 (1967), cert. denied, 392 U.S. 906, 88 S.Ct. 2058, 20 L.Ed.2d 1364 (1968). Because the complaint issued by the Regional Director states that the Acting Counsel General is seeking to prevent Elm Grove from enforcing the circuit court’s injunction, it seems apparent that a motion by Elm Grove to intervene in the proceedings would be granted. See generally 51A C.J.S. Labor Relations § 551. Consequently, the rationale underlying the Supreme Court’s refusal to preempt state court jurisdiction in Sears is not present in this case.17
The Union also claims that Elm Grove never advanced this position below and, therefore, has waived it. More importantly, the Union points to the language in note 44 of Sears, 436 U.S. at 207-08, 98 S.Ct. at 1763, 56 L.Ed.2d at 232, where the Court stated that a demand to discontinue the trespass is necessary “in order to avoid a valid claim of pre-emption ... as a matter of federal law[.]” 18 Elm Grove made no such demand of the Union.
Finally, we point out that our decision does not affect the circuit court’s order insofar as it enjoined the pickets from engaging in obstructive, disruptive, or in[20]*20timidating behavior. Such conduct is not protected under the Act and is clearly subject to state court control in the first instance, even though the NLRB is considering an unfair labor practice charge filed by a union arising out of the same incident. See Youngdahl v. Rainfair, Inc., 355 U.S. 131, 78 S.Ct. 206, 2 L.Ed.2d 151 (1957); Rainbow Tours, Inc. v. Hawaii Joint Council of Teamsters, 704 F.2d 1443 (9th Cir.1983); Kaplan’s Fruit & Produce Co. v. Superior Court, 26 Cal.3d 60, 160 Cal. Rptr. 745, 603 P.2d 1341 (1979); PTA Sales, Inc. v Retail Clerks Local No. 462, 96 N.M. 581, 633 P.2d 689 (1981). See also 51A C.J.S. Labor Relations § 527.
For the reasons stated above, we conclude that the circuit court erred in issuing the injunction on behalf of Elm Grove and Riesbeck to the extent that it moved the location of the picketing. State court jurisdiction was preempted by the Union’s filing of the unfair labor practice charge with the NLRB. Consequently, we reverse the judgment of the circuit court insofar as it enjoined the Union from peaceful picketing and/or handbilling on shopping center property.
Reversed.
NEELY, J., dissents.