11 CFR § 115.2 - Prohibition.
(a) It shall be unlawful for a Federal contractor, as defined in § 115.1(a), to make, either directly or indirectly, any contribution or expenditure of money or other thing of value, or to promise expressly or impliedly to make any such contribution or expenditure to any political party, committee, or candidate for Federal office or to any person for any political purpose or use. This prohibition does not apply to contributions or expenditures in connection with State or local elections.
(b) This prohibition runs for the time period set forth in § 115.1(b).
(c) It shall be unlawful for any person knowingly to solicit any such contribution from a Federal contractor.