5 CFR 293.105 - Restrictions on collection and use of information.
(a) First Amendment. Personnel records describing how individuals exercise rights guaranteed by the First Amendment are prohibited unless expressly authorized by statute, or by the individual concerned, or unless pertinent to and within the scope of an authorized law enforcement activity. These rights include, but are not limited to, free exercise of religious and political beliefs, freedom of speech and the press, and freedom to assemble and to petition the government.
(b) Social Security Number.
(i) Under Federal statute; or
(ii) Under any statute, Executive order, or regulation that authorizes any Federal, State, or local agency maintaining a system of records that was in existence and operating prior to January 1, 1975, to request the Social Security Number as a necessary means of verifying the identity of an individual.
(2) Individuals asked to voluntarily (circumstances not covered by paragraph (b)(1) of this section) provide their Social Security Number shall suffer no penalty or denial of benefits for refusing to provide it.