"Subversive activities." . . "Internal security." . . "Subversive activities United States." . . "United States." . . "United States. Congress. House. Committee on Internal Security." . . "Internal security United States." . . . . . . . . . . . "Hearings regarding the administration of the Subversive activities control act of 1950 and the Federal civilian employee loyalty-security program: hearings before the Committee on Internal Security, House of Representatives, Ninety-first Congress, first -[second] session[s]"@en . . "Hearings regarding the administration of the Subversive activities control act of 1950 and the Federal civilian employee loyalty-security program: hearings before the Committee on Internal Security, House of Representatives, Ninety-first Congress, first -[second] session[s]" . . . . . . . . . .