To require identification of communist-front organizations to appear on matter sent, or caused to be sent, by or for them through the mails. : Hearings before the Committee on Post Office and Civil Service, House of Representatives, Eighty-first Congress, first session, on H. R. 1002 (H. R. 5265), a bill to require identification of communist-front organizations to appear on matter sent, or caused to be sent, by or for them through the mails. March 10, 1949.