In the Senate, the primary committee for investigating Communists was the Senate Internal Security Subcommittee (SISS), formed in 1950 and charged with ensuring the enforcement of laws relating to "espionage, sabotage, and the protection of the internal security of the United States."
在参议院中，负责调查共产党人的委员会是内部安全委员会(SISS)，自1950年建立，负责“对间谍、破坏和对美国内部安保”的执法。