What are the four major pieces of anti-communist legislation during McCarthyism?

House Un-American Activities Comittee (HUAC) - investigated "communist" activities and arrested several including the "Hollywood 10" and were involved in the Alger Hiss Case

McCarran Security Act (1950) - communist organizations must register with the government and publish all of their records

Alger Hiss Case - Alger Hiss accused and convicted for espionage and perjury

Two More: Communist Control Act of 1954 and McCarran-Walter Act of 1952