Mr. Chief Justice Warren
delivered the opinion of the Court.
The appellees were charged by information with violation of the Federal Regulation of Lobbying Act, 60 Stat. 812, 839, 2 U. S. C. §§ 261-270. Relying on its previous [614]*614decision in National Association of Manufacturers v. McGrath, 103 F. Supp. 510, vacated as moot, 344 U. S. 804, the District Court dismissed the information on the ground that the Act is unconstitutional. 109 F. Supp. 641. The case is here on direct appeal under the Criminal Appeals Act, 18 U. S. C. § 3731.
Seven counts of the information are laid under § 305, which requires designated reports to Congress from every person “receiving any contributions or expending any money” for the purpose of influencing the passage or defeat of any legislation by Congress.1 One such count charges the National Farm Committee, a Texas corpora[615]*615tion, with failure to report the solicitation and receipt of contributions to influence the passage of legislation which would cause a rise in the price of agricultural commodities and commodity futures and the defeat of legislation which would cause a decline in those prices. The remaining six counts under § 305 charge defendants Moore and Harriss with failure to report expenditures having the same single purpose. Some of the alleged expenditures consist of the payment of compensation to others to communicate face-to-face with members of Congress, at public functions and committee hearings, concerning legislation affecting agricultural prices; the other alleged expenditures relate largely to the costs of a campaign to induce various interested groups and individuals to communicate by letter with members of Congress on such legislation.
The other two counts in the information are laid under § 308, which requires any person “who shall engage himself for pay or for any consideration for the purpose of attempting to influence the passage or defeat of any legislation” to register with Congress and to make specified disclosures.2 These two counts allege in considerable [616]*616detail that defendants Moore and Linder were hired to express certain views to Congress as to agricultural prices or to cause others to do so, for the purpose of attempting to influence the passage of legislation which would cause a rise in the price of agricultural commodities and commodity futures and a defeat of legislation which would cause a decline in such prices; and that pursuant to this undertaking, without having registered as required by [617]*617§ 308, they arranged to have members of Congress contacted on behalf of these views, either directly by their own emissaries or through an artificially stimulated letter campaign.3
We are not concerned here with the sufficiency of the information as a criminal pleading. Our review under the Criminal Appeals Act is limited to a decision on the alleged “invalidity” of the statute on which the information is based.4 In making this decision, we judge the statute on its face. See United States v. Petrillo, 332 U. S. 1, 6, 12. The “invalidity” of the Lobbying Act is asserted on three grounds: (1) that §§ 305, 307, and 308 are too vague and indefinite to meet the requirements of due process; (2) that §§ 305 and 308 violate the First Amendment guarantees of freedom of speech, freedom of the press, and the right to petition the Government; (3) that the penalty provision of § 310 (b) violates the right of the people under the First Amendment to petition the Government.
I.
The constitutional requirement of definiteness is violated by a criminal statute that fails to give a person of ordinary intelligence fair notice that his contemplated conduct is forbidden by the statute. The underlying principle is that no man shall be held criminally responsible for conduct which he could not reasonably understand to be proscribed.5
[618]*618On the other hand, if the general class of offenses to which the statute is directed is plainly within its terms, the statute will not be struck down as vague, even though marginal cases could be put where doubts might arise. United States v. Petrillo, 332 U. S. 1, 7. Cf. Jordan v. De George, 341 U. S. 223, 231. And if this general class of offenses can be made constitutionally definite by a reasonable construction of the statute, this Court is under a duty to give the statute that construction. This was the course adopted in Screws v. United States, 325 U. S. 91, upholding the definiteness of the Civil Rights Act.6
The same course is appropriate here. The key section of the Lobbying Act is § 307, entitled “Persons to Whom Applicable.” Section 307 provides:
“The provisions of this title shall apply to any person (except a political committee as defined in [619]*619the Federal Corrupt Practices Act, and duly organized State or local committees of a political party), who by himself, or through any agent or employee or other persons in any manner whatsoever, directly or indirectly, solicits, collects, or receives money or any other thing of value to be used principally to aid, or the principal purpose of which person is to aid, in the accomplishment of any of the following purposes:
“(a) The passage or defeat of any legislation by the Congress of the United States.
“(b) To influence, directly or indirectly, the passage or defeat of any legislation by the Congress of the United States.”
This section modifies the substantive provisions of the Act, including § 305 and § 308. In other words, unless a “person” falls within the category established by § 307, the disclosure requirements of § 305 and § 308 are inapplicable.7 Thus coverage under the Act is limited to those persons (except for the specified political committees) who solicit, collect, or receive contributions of money or other thing of value, and then only if “the principal purpose” of either the persons or the contributions is to aid in the accomplishment of the aims set forth in § 307 (a) and (b). In any event, the solicitation, collection, or receipt of money or other thing of value is a prerequisite to coverage under the Act.
The Government urges a much broader construction— namely, that under § 305 a person must report his expenditures to influence legislation even though he does not solicit, collect, or receive contributions as provided in [620]*620§ 307.8 Such a construction, we believe, would do violence to the title and language of § 307 as well as its legislative history.9 If the construction urged by the Government is to become law, that is for Congress to accomplish by further legislation.
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Mr. Chief Justice Warren
delivered the opinion of the Court.
The appellees were charged by information with violation of the Federal Regulation of Lobbying Act, 60 Stat. 812, 839, 2 U. S. C. §§ 261-270. Relying on its previous [614]*614decision in National Association of Manufacturers v. McGrath, 103 F. Supp. 510, vacated as moot, 344 U. S. 804, the District Court dismissed the information on the ground that the Act is unconstitutional. 109 F. Supp. 641. The case is here on direct appeal under the Criminal Appeals Act, 18 U. S. C. § 3731.
Seven counts of the information are laid under § 305, which requires designated reports to Congress from every person “receiving any contributions or expending any money” for the purpose of influencing the passage or defeat of any legislation by Congress.1 One such count charges the National Farm Committee, a Texas corpora[615]*615tion, with failure to report the solicitation and receipt of contributions to influence the passage of legislation which would cause a rise in the price of agricultural commodities and commodity futures and the defeat of legislation which would cause a decline in those prices. The remaining six counts under § 305 charge defendants Moore and Harriss with failure to report expenditures having the same single purpose. Some of the alleged expenditures consist of the payment of compensation to others to communicate face-to-face with members of Congress, at public functions and committee hearings, concerning legislation affecting agricultural prices; the other alleged expenditures relate largely to the costs of a campaign to induce various interested groups and individuals to communicate by letter with members of Congress on such legislation.
The other two counts in the information are laid under § 308, which requires any person “who shall engage himself for pay or for any consideration for the purpose of attempting to influence the passage or defeat of any legislation” to register with Congress and to make specified disclosures.2 These two counts allege in considerable [616]*616detail that defendants Moore and Linder were hired to express certain views to Congress as to agricultural prices or to cause others to do so, for the purpose of attempting to influence the passage of legislation which would cause a rise in the price of agricultural commodities and commodity futures and a defeat of legislation which would cause a decline in such prices; and that pursuant to this undertaking, without having registered as required by [617]*617§ 308, they arranged to have members of Congress contacted on behalf of these views, either directly by their own emissaries or through an artificially stimulated letter campaign.3
We are not concerned here with the sufficiency of the information as a criminal pleading. Our review under the Criminal Appeals Act is limited to a decision on the alleged “invalidity” of the statute on which the information is based.4 In making this decision, we judge the statute on its face. See United States v. Petrillo, 332 U. S. 1, 6, 12. The “invalidity” of the Lobbying Act is asserted on three grounds: (1) that §§ 305, 307, and 308 are too vague and indefinite to meet the requirements of due process; (2) that §§ 305 and 308 violate the First Amendment guarantees of freedom of speech, freedom of the press, and the right to petition the Government; (3) that the penalty provision of § 310 (b) violates the right of the people under the First Amendment to petition the Government.
I.
The constitutional requirement of definiteness is violated by a criminal statute that fails to give a person of ordinary intelligence fair notice that his contemplated conduct is forbidden by the statute. The underlying principle is that no man shall be held criminally responsible for conduct which he could not reasonably understand to be proscribed.5
[618]*618On the other hand, if the general class of offenses to which the statute is directed is plainly within its terms, the statute will not be struck down as vague, even though marginal cases could be put where doubts might arise. United States v. Petrillo, 332 U. S. 1, 7. Cf. Jordan v. De George, 341 U. S. 223, 231. And if this general class of offenses can be made constitutionally definite by a reasonable construction of the statute, this Court is under a duty to give the statute that construction. This was the course adopted in Screws v. United States, 325 U. S. 91, upholding the definiteness of the Civil Rights Act.6
The same course is appropriate here. The key section of the Lobbying Act is § 307, entitled “Persons to Whom Applicable.” Section 307 provides:
“The provisions of this title shall apply to any person (except a political committee as defined in [619]*619the Federal Corrupt Practices Act, and duly organized State or local committees of a political party), who by himself, or through any agent or employee or other persons in any manner whatsoever, directly or indirectly, solicits, collects, or receives money or any other thing of value to be used principally to aid, or the principal purpose of which person is to aid, in the accomplishment of any of the following purposes:
“(a) The passage or defeat of any legislation by the Congress of the United States.
“(b) To influence, directly or indirectly, the passage or defeat of any legislation by the Congress of the United States.”
This section modifies the substantive provisions of the Act, including § 305 and § 308. In other words, unless a “person” falls within the category established by § 307, the disclosure requirements of § 305 and § 308 are inapplicable.7 Thus coverage under the Act is limited to those persons (except for the specified political committees) who solicit, collect, or receive contributions of money or other thing of value, and then only if “the principal purpose” of either the persons or the contributions is to aid in the accomplishment of the aims set forth in § 307 (a) and (b). In any event, the solicitation, collection, or receipt of money or other thing of value is a prerequisite to coverage under the Act.
The Government urges a much broader construction— namely, that under § 305 a person must report his expenditures to influence legislation even though he does not solicit, collect, or receive contributions as provided in [620]*620§ 307.8 Such a construction, we believe, would do violence to the title and language of § 307 as well as its legislative history.9 If the construction urged by the Government is to become law, that is for Congress to accomplish by further legislation.
We now turn to the alleged vagueness of the purposes set forth in § 307 (a) and (b). As in United States v. Rumely, 345 U. S. 41, 47, which involved the interpretation of similar language, we believe this language should be construed to refer only to “lobbying in its commonly accepted sense” — to direct communication with members of Congress on pending or proposed federal legislation. The legislative history of the Act makes clear that, at the very least, Congress sought disclosure of such direct pressures, exerted by the lobbyists themselves or through their hirelings or through an artificially stimulated letter campaign.10 It is likewise clear that Congress would have [621]*621intended the Act to operate on this narrower basis, even if a broader application to organizations seeking to propagandize the general public were not permissible.11
There remains for our consideration the meaning of “the principal purpose” and “to be used principally to [622]*622aid.” The legislative history of the Act indicates that the term “principal” was adopted merely to exclude from the scope of § 307 those contributions and persons having only an “incidental” purpose of influencing legislation.12 Conversely, the “principal purpose” requirement does not exclude a contribution which in substantial part is to be used to influence legislation through direct communication with Congress or a person whose activities in substantial part are directed to influencing legislation through direct communication with Congress.13 If it were otherwise — if an organization, for example, were exempted [623]*623because lobbying was only one of its main activities— the Act would in large measure be reduced to a mere exhortation against abuse of the legislative process. In construing the Act narrowly to avoid constitutional doubts, we must also avoid a construction that would seriously impair the effectiveness of the Act in coping with the problem it was designed to alleviate.
To summarize, therefore, there are three prerequisites to coverage under §307: (1) the “person” must have solicited, collected, or received contributions; (2) one of the main purposes of such “person,” or one of the main purposes of such contributions, must have been to influence the passage or defeat of legislation by Congress; (3) the intended method of accomplishing this purpose must have been through direct communication with members of Congress. And since § 307 modifies the substantive provisions of the Act, our construction of § 307 will of necessity also narrow the scope of § 305 and § 308, the substantive provisions underlying the information in this case. Thus § 305 is limited to those persons who are covered by § 307; and when so covered, they must report all contributions and expenditures having the purpose of attempting to influence legislation through direct communication with Congress. Similarly, § 308 is limited to those persons (with the stated exceptions14) who are covered by § 307 and who, in addition, engage themselves [624]*624for pay or for any other valuable consideration for the purpose of attempting to influence legislation through direct communication with Congress. Construed in this way, the Lobbying Act meets the constitutional requirement of definiteness.15
[625]*625II.
Thus construed, §§ 305 and 308 also do not violate the freedoms guaranteed by the First Amendment — freedom to speak, publish, and petition the Government.
Present-day legislative complexities are such that individual members of Congress cannot be expected to explore the myriad pressures to which they are regularly subjected. Yet full realization of the American ideal of government by elected representatives depends to no small extent on their ability to properly evaluate such pressures. Otherwise the voice of the people may all too easily be drowned out by the voice of special interest groups seeking favored treatment while masquerading as proponents of the public weal. This is the evil which the Lobbying Act was designed to help prevent.16
Toward that end, Congress has not sought to prohibit these pressures. It has merely provided for a modicum of information from those who for hire attempt to influence legislation or who collect or spend funds for that purpose. It wants only to know who is being hired, who is putting up the money, and how much. It acted in the same spirit and for a similar purpose in passing the Federal Corrupt Practices Act — to maintain the integrity of a basic governmental process. See Burroughs and Cannon v. United States, 290 U. S. 534, 545.
Under these circumstances, we believe that Congress, at least within the bounds of the Act as we have construed it, is not constitutionally forbidden to require the disclosure of lobbying activities. To do so would be to deny Congress in large measure the power of self-protec[626]*626tion. And here Congress has used that power in a manner restricted to its appropriate end. We conclude that §§ 305 and 308, as applied to persons defined in § 307, do not offend the First Amendment.
It is suggested, however, that the Lobbying Act, with respect to persons other than those defined in § 307, may as a practical matter act as a deterrent to their exercise of First Amendment rights. Hypothetical borderline situations are conjured up in which such persons choose to remain silent because of fear of possible prosecution for failure to comply with the Act. Our narrow construction of the Act, precluding as it does reasonable fears, is calculated to avoid such restraint. But, even assuming some such deterrent effect, the restraint is at most an indirect one resulting from self-censorship, comparable in many ways to the restraint resulting from criminal libel laws.17 The hazard of such restraint is too remote to require striking down a statute which on its face is otherwise plainly within the area of congressional power and is designed to safeguard a vital national interest.
III.
The appellees further attack the statute on the ground that the penalty provided in § 310 (b) is unconstitutional. That section provides:
“(b) In addition to the penalties provided for in subsection (a), any person convicted of the misdemeanor specified therein is prohibited, for a period of three years from the date of such conviction, from attempting to influence, directly or indirectly, the passage or defeat of any proposed legislation or from [627]*627appearing before a committee of the Congress in support of or opposition to proposed legislation; and any person who violates any provision of this subsection shall, upon conviction thereof, be guilty of a felony, and shall be punished by a fine of not more than $10,000, or imprisonment for not more than five years, or by both such fine and imprisonment.”
This section, the appellees argue, is a patent violation of the First Amendment guarantees' of freedom of speech and the right to petition the Government.
We find it unnecessary to pass on this contention. Unlike §§ 305, 307, and 308 which we have judged on their face, § 310 (b) has not yet been applied to the appellees, and it will never be so applied if the appellees are found innocent of the charges against them. See United States v. Wurzbach, 280 U. S. 396, 399; United States v. Petrillo, 332 U. S. 1, 9-12.
Moreover, the Act provides for the separability of any provision found invalid.18 If § 310 (b) should ultimately be declared unconstitutional, its elimination would still leave a statute defining specific duties and providing a specific penalty for violation of any such duty. The prohibition of § 310 (b) is expressly stated to be “In addition to the penalties provided for in subsection (a) . . subsection (a) makes a violation of § 305 or § 308 a misdemeanor, punishable by fine or imprisonment or both. Consequently, there would seem to be no obstacle to giving effect to the separability clause as to § 310 (b), if this should ever prove necessary. Compare Electric Bond & Share Co. v. Securities & Exchange Commission, 303 U. S. 419, 433-437.
[628]*628The judgment below is reversed and the cause is remanded to the District Court for further proceedings not inconsistent with this opinion.
Reversed.
Mr. Justice Clark took no part in the consideration or decision of this case.