Seventy employers, including giants such as Microsoft and Starbucks, have signed on as amici in the case of Gill v OPM which challenges the constitutionality of Section 3 of the Defense of Marriage Act (DOMA). Also included in the amici are the cities of Boston, New York and Cambridge and Trillium Asset Managemet, a socially responsible investment manager. There are several prestigious law firms including Burns and Levinson.