Greaney, J.
We transferred this case to this court on our own motion to consider arguments made by the school committee of Brockton (school committee) alleging error in a decision of the Massachusetts Commission Against Discrimination (commission). The commission accepted the decision of a hearing commissioner,2 which found that the school committee had engaged in unlawftd sex discrimination in violation of G. L. c. 151B, § 4 (1) (1994 ed.), by denying accrued sick leave benefits to teachers disabled by pregnancy, and awarded damages and interest to the harmed teachers. The commission itself awarded attorney’s fees to the teachers. We afiirm the commission’s decision.
The background of the case is as follows. On August 17, 1979, the Brockton Education Association (union)3 filed a class action complaint with the commission against the school committee. The complaint was filed on behalf of teachers in the Brockton public schools who, from January, 1973, to December, 1978, had requested and been denied the use of accrued sick leave for pregnancy-related disabilities.4 The complaint stemmed from this court’s decision on February 28, 1979, in School Comm. of Brockton v. Massachusetts Comm’n Against Discrimination, 377 Mass. 392 (1979) (Brockton decision), which upheld a commission decision that [9]*9the school committee had violated G. L. c. 15IB, § 4, by discriminating on the basis of sex against Cynthia Zettlemoyer, a Brockton public school teacher, when it denied her January, 1973, request to use her accrued sick leave during her pregnancy-related disability.
On 114 occasions while the Zettlemoyer complaint was pending, public school teachers in Brockton requested to apply their accrued sick leave to the period of their pregnancy-related disabilities. The requests were denied.5 Each teacher’s request was presented to the school committee by the Brock-ton school superintendent, along with the superintendent’s recommendation for handling the request. During 1973, 1974, and the first five months of 1975, the superintendent’s recommendations to the school committee were phrased in different ways, but some referred to a test case on the issue of allowing sick leave for maternity-related disabilities, and indicated that the teachers’ ultimate eligibility for sick leave benefits would depend on the outcome of the test case.6 In some cases which arose as early as February 16, 1975, and in all cases which arose on and after May 20, 1975, the superintendent’s recommendation to the school committee was to grant any application for maternity leave “without pay and without sick leave pending a court decision.”
During 1973, 1974, and the first ten and one-half months of 1975, the school committee responded to pregnant teachers’ requests for sick leave benefits with letters which were worded in different ways, some of which stated that the teacher’s ultimate eligibility for the requested benefits would depend on the outcome of a court case on the issue. In some cases which arose as early as January 22, 1975, and in all cases which arose after October 15, 1975, the school committee responded to the teachers’ requests with a form letter stating that “[s]ince the question of sick leave for maternity has yet to be resolved in a test case, it is not possible to grant your request for this.” It is undisputed that the test case [10]*10referred to in all of these statements and letters was the Brock-ton decision.7
Shortly after our decision in the Brockton decision, the union requested payment from the school committee of accrued sick leave benefits for the pregnant teachers who had requested, but been denied, benefits during the pendency of the Zettlemoyer complaint. In a letter sent on April 25, 1979, the school committee denied the union’s request, stating that it would not grant retroactive benefits under the Brockton decision, unless the teacher claiming benefits had filed a complaint with the commission on the denial of her request. The union proceeded to file the present class action complaint.
The school committee recognizes that teachers in the same position as Zettlemoyer have suffered discrimination, a conclusion established by the Brockton decision. The school committee, however, makes a variety of arguments, which we next discuss, on why the commission’s decision nevertheless should be set aside.
1. Statute of limitations. General Laws c. 151B, § 5 (1994 ed.), requires that a charge of discrimination be filed with the commission within six months of the occurrence of the discriminatory act. The school committee asserts that the discriminatory acts against the class members occurred between 1973 and 1978, when the teachers initially were denied accrued sick leave for pregnancy-related disabilities. The school committee concludes that, since the complaint was not filed within six months of these initial denials, it is barred by § 5.
The commission upheld the hearing commissioner’s findings that the denial notifications received by the teachers between 1973 and 1978 were conditional denials, with the final decision on benefits reserved until after the conclusion of the Brockton decision; that the school committee did not make a final, unconditional decision to deny benefits until it sent its [11]*11April 25, 1979, letter to the union; and, accordingly, that the statute of limitations began to run on April 25, 1979, less than six months before the union filed its complaint.
The commission accepts facts found by the hearing commissioner if they are supported by substantial evidence, 804 Code Mass. Regs. § 1.16(8) (1986), and a reviewing court gives similar acceptance to the commission’s determinations. Lynn Teachers Union, Local 1037 v. Massachusetts Comm’n Against Discrimination, 406 Mass. 515, 517 n.l (1990). “Substantial evidence” is defined as “such evidence as a reasonable mind might accept as adequate to support a conclusion.” G. L. c. 30A, § 1 (6) (1994 ed.).
There was substantial evidence before the hearing commissioner that the school committee’s initial letters denying the teachers’ requests to use accrued sick leave were tentative and conditional in nature and, reasonably interpreted, that the letters expressed an intent not to make a final determination on benefits until the Brockton decision had been decided. For example, many of the letters sent by the school committee to teachers before October, 1975, and all the letters sent afterwards, expressly made reference to a test case on using accrued sick leave for pregnancy-related disability, and suggested that a final decision as to eligibility for benefits would rest on the outcome of that case. The recommendations of the superintendent to the school committee followed a similar Une.
Based on this and other evidence, the commission properly accepted the hearing commissioner’s findings that the statute of limitations began to run on April 25, 1979, when the school committee communicated its final, unconditional decision to deny the requested benefits. See Wheatley v. American Tel & Tel Co., 418 Mass. 394, 398 (1994) (“The statutory period for complaining of a discriminatory termination does not begin to run until the employee has sufficient notice of that specific act” [citation omitted]). The union’s complaint, therefore, was seasonably filed.8
2.
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Greaney, J.
We transferred this case to this court on our own motion to consider arguments made by the school committee of Brockton (school committee) alleging error in a decision of the Massachusetts Commission Against Discrimination (commission). The commission accepted the decision of a hearing commissioner,2 which found that the school committee had engaged in unlawftd sex discrimination in violation of G. L. c. 151B, § 4 (1) (1994 ed.), by denying accrued sick leave benefits to teachers disabled by pregnancy, and awarded damages and interest to the harmed teachers. The commission itself awarded attorney’s fees to the teachers. We afiirm the commission’s decision.
The background of the case is as follows. On August 17, 1979, the Brockton Education Association (union)3 filed a class action complaint with the commission against the school committee. The complaint was filed on behalf of teachers in the Brockton public schools who, from January, 1973, to December, 1978, had requested and been denied the use of accrued sick leave for pregnancy-related disabilities.4 The complaint stemmed from this court’s decision on February 28, 1979, in School Comm. of Brockton v. Massachusetts Comm’n Against Discrimination, 377 Mass. 392 (1979) (Brockton decision), which upheld a commission decision that [9]*9the school committee had violated G. L. c. 15IB, § 4, by discriminating on the basis of sex against Cynthia Zettlemoyer, a Brockton public school teacher, when it denied her January, 1973, request to use her accrued sick leave during her pregnancy-related disability.
On 114 occasions while the Zettlemoyer complaint was pending, public school teachers in Brockton requested to apply their accrued sick leave to the period of their pregnancy-related disabilities. The requests were denied.5 Each teacher’s request was presented to the school committee by the Brock-ton school superintendent, along with the superintendent’s recommendation for handling the request. During 1973, 1974, and the first five months of 1975, the superintendent’s recommendations to the school committee were phrased in different ways, but some referred to a test case on the issue of allowing sick leave for maternity-related disabilities, and indicated that the teachers’ ultimate eligibility for sick leave benefits would depend on the outcome of the test case.6 In some cases which arose as early as February 16, 1975, and in all cases which arose on and after May 20, 1975, the superintendent’s recommendation to the school committee was to grant any application for maternity leave “without pay and without sick leave pending a court decision.”
During 1973, 1974, and the first ten and one-half months of 1975, the school committee responded to pregnant teachers’ requests for sick leave benefits with letters which were worded in different ways, some of which stated that the teacher’s ultimate eligibility for the requested benefits would depend on the outcome of a court case on the issue. In some cases which arose as early as January 22, 1975, and in all cases which arose after October 15, 1975, the school committee responded to the teachers’ requests with a form letter stating that “[s]ince the question of sick leave for maternity has yet to be resolved in a test case, it is not possible to grant your request for this.” It is undisputed that the test case [10]*10referred to in all of these statements and letters was the Brock-ton decision.7
Shortly after our decision in the Brockton decision, the union requested payment from the school committee of accrued sick leave benefits for the pregnant teachers who had requested, but been denied, benefits during the pendency of the Zettlemoyer complaint. In a letter sent on April 25, 1979, the school committee denied the union’s request, stating that it would not grant retroactive benefits under the Brockton decision, unless the teacher claiming benefits had filed a complaint with the commission on the denial of her request. The union proceeded to file the present class action complaint.
The school committee recognizes that teachers in the same position as Zettlemoyer have suffered discrimination, a conclusion established by the Brockton decision. The school committee, however, makes a variety of arguments, which we next discuss, on why the commission’s decision nevertheless should be set aside.
1. Statute of limitations. General Laws c. 151B, § 5 (1994 ed.), requires that a charge of discrimination be filed with the commission within six months of the occurrence of the discriminatory act. The school committee asserts that the discriminatory acts against the class members occurred between 1973 and 1978, when the teachers initially were denied accrued sick leave for pregnancy-related disabilities. The school committee concludes that, since the complaint was not filed within six months of these initial denials, it is barred by § 5.
The commission upheld the hearing commissioner’s findings that the denial notifications received by the teachers between 1973 and 1978 were conditional denials, with the final decision on benefits reserved until after the conclusion of the Brockton decision; that the school committee did not make a final, unconditional decision to deny benefits until it sent its [11]*11April 25, 1979, letter to the union; and, accordingly, that the statute of limitations began to run on April 25, 1979, less than six months before the union filed its complaint.
The commission accepts facts found by the hearing commissioner if they are supported by substantial evidence, 804 Code Mass. Regs. § 1.16(8) (1986), and a reviewing court gives similar acceptance to the commission’s determinations. Lynn Teachers Union, Local 1037 v. Massachusetts Comm’n Against Discrimination, 406 Mass. 515, 517 n.l (1990). “Substantial evidence” is defined as “such evidence as a reasonable mind might accept as adequate to support a conclusion.” G. L. c. 30A, § 1 (6) (1994 ed.).
There was substantial evidence before the hearing commissioner that the school committee’s initial letters denying the teachers’ requests to use accrued sick leave were tentative and conditional in nature and, reasonably interpreted, that the letters expressed an intent not to make a final determination on benefits until the Brockton decision had been decided. For example, many of the letters sent by the school committee to teachers before October, 1975, and all the letters sent afterwards, expressly made reference to a test case on using accrued sick leave for pregnancy-related disability, and suggested that a final decision as to eligibility for benefits would rest on the outcome of that case. The recommendations of the superintendent to the school committee followed a similar Une.
Based on this and other evidence, the commission properly accepted the hearing commissioner’s findings that the statute of limitations began to run on April 25, 1979, when the school committee communicated its final, unconditional decision to deny the requested benefits. See Wheatley v. American Tel & Tel Co., 418 Mass. 394, 398 (1994) (“The statutory period for complaining of a discriminatory termination does not begin to run until the employee has sufficient notice of that specific act” [citation omitted]). The union’s complaint, therefore, was seasonably filed.8
2. Laches. The school committee argues that delay in the [12]*12resolution of the complaint, occasioned by the union’s and the teachers’ delay in filing the charge, and the commission’s delay in processing the charge, requires dismissal of the complaint on the basis of the doctrine of loches. We reject this argument.
This case was pending before the commission for over eleven years before a final decision was reached. The delay is regrettable, but we see no basis for assigning any blame for the delay to the union or the teachers seeking benefits. Rather, the delay appears to be attributable, in part, to the school committee’s choosing to litigate every important facet of the case. The school committee, of course, had a right to do so, but delay caused by the school committee’s intense litigation tactics should not be held against the union and the teachers. The backlog of cases pending at the commission, and the commission’s lack of resources, also appear to have contributed to the delay. That situation, while unfortunate, also cannot bar the union’s and the teachers’ claims.9 Delay which is [13]*13not caused by the party bringing an action before the commission cannot furnish a basis for the application of loches.
3. Remaining issues, (a) The investigating commissioner denied the school committee’s motion to join the union as a party-respondent because the commission has no rule allowing for third-party practice. The school committee argues that the commission’s lack of a formal third-party practice rule deprived it of due process by preventing it from bringing a claim for contribution against the union.10 Under G. L. c. 23IB, §§ 1 and 2 (1994 ed.), the commission has recognized a right of contribution against a union which is found to be jointly liable, along with an employer, for discrimination.
Without expressly addressing the issue of a third-party practice rule, the hearing commissioner concluded that the school committee had no right to seek contribution from the union because there was “no showing that the union participated in the discriminatory acts.” The hearing commissioner’s findings of fact on which this conclusion is based are supported by substantial evidence which demonstrates that the union had consistently acted on behalf of, and in favor of, the teachers.11 Accordingly, the school committee’s motion [14]*14was correctly denied without regard to the commission’s lack of a formal third-party practice rule.
(b) The school committee argues that the union was not a proper class representative of the teachers, that class certification therefore should have been withdrawn, and, once withdrawn, that the school committee’s motion to dismiss the complaint should have been allowed.12
There is substantial evidence to support the hearing commissioner’s findings (which led her to confirm the union as a class representative for any prospective relief) that (1) there was no conflict in the union representing the class vis-a-vis the rest of its membership; (2) the union can, and has, satisfactorily represented the interests of the class; and (3) the union is an ideal representative of the class for any award of prospective relief.
There is no indication (beyond the school committee’s speculation) that a conflict existed between the affected teachers and the union membership at large. See Social Servs. Union, Local 535 v. County of Santa Clara, 609 F.2d 944, 948 (9th Cir. 1979) (finding assumption that male union members would suffer pecuniary injury if the pay of female employees was raised to be purely speculative).
The hearing commissioner appropriately found that the same findings of fact, which supported her affirmation of the dismissal of the motion to join the union as a party-respondent, supported a finding that the union was a proper [15]*15class representative. See note 11, supra.13 Accordingly, the school committee’s motion to dismiss was properly denied.
(c) The hearing commissioner assessed damages for a majority of the individual teachers predominantly by relying on letters from the physicians who cared for the women during their pregnancies, which indicated the period of disability attributable to each pregnancy. The letters were hearsay which the school committee maintained should not have been admitted or given probative weight by the hearing commissioner. The argument lacks merit: The letters provided substantial evidence upon which , the hearing commissioner could determine length of disability to be used for assessing and awarding damages.
In administrative proceedings, hearsay evidence can be received and may constitute substantial evidence if it contains sufficient indicia of reliability and probative value. Embers of Salisbury, Inc. v. Alcoholic Beverages Control Comm’n, 401 Mass. 526, 530 (1988). The commission, and not the court, is the sole judge of the credibility and weight of the evidence before it. Id. at 529. A court will overturn the commission’s findings only if the court concludes, as matter of law, that the commission’s reliance on evidence was unreasonable.
The physicians’ letters contained sufficient indicia of reliability and probative value to constitute substantial evidence. The hearing commissioner reasonably could have found that the letters were reliable and probative because: (1) each was prepared by a physician who had treated the teacher in question personally, see Richardson v. Perales, 402 U.S. 389, 403 (1971); (2) there was an unquestionably high degree of consistency among the different physicians’ letters in assessing the length of disability suffered by teachers with the same disability, cf. id. at 404; (3) the school committee did not take advantage of its right to subpoena and cross-examine any of [16]*16the physicians, see id. at 404-405; (4) the question of how long any teacher was disabled as a result of pregnancy does not require a great deal of substantiating detail; and (5) the school committee did not present any evidence to contradict the periods of disability stated in the letters. See Murphy v. Superintendent, Mass. Correctional Inst., Cedar Junction, 396 Mass. 830, 834 (1986).
Finally, it is not a problem that the letters were written in contemplation of litigation. The hearing commissioner did not find any basis to believe the physicians would lie in the letters and, as has been stated, the school committee had the opportunity to examine the physicians and test their credibility.14
(d) While the case was pending before the full commission, G. L. c. 151B, § 5, was amended by St. 1989, c. 722, § 27, to allow a complainant who prevails before the commission to be awarded attorney’s fees. Contrary to the school committee’s argument, the commission correctly gave retroactive effect to the attorney’s fees amendment. In Fontaine v. Ebtec Corp., 415 Mass. 309, 320 (1993), we noted that St. 1989, c. 722, § 27, simply entitled complainants who pursued their cases before the commission to a remedy commensurate with the remedy to which they would have been entitled if they had filed suit and prevailed in a State or Federal court. Because the amendment merely was providing complainants with an adequate alternative forum for remedying discrimination, we stated it was appropriate for the commission to give it retrospective application. Id. Based on Fontaine, the commission’s decision to grant attorney’s fees in this case was correct.
The decision of the commission is affirmed.
So ordered.