federal law passed in 1940 that made it a criminal offense to advocate the violent overthrow of the government or to organize or be a member of any group or society.
American government official who was accused of spying for the Soviet Union in 1948
The Soviets tested their first atomic bomb and the US was shocked they had so much atomic bomb ideas that early.
Soviets were taking over china the most populated country in the world.
During the McCarthy era, hundreds of Americans were accused of being communists or communist sympathizers
In the Hollywood Ten it was an American short documentary about speech denouncing McCarthyism and the Hollywood blacklisting.
it created a Subversive Activities Control Board which on the petition of the attorney general could order an organization it determined to be communist to register with the Justice Department
Julius and Ethel Rosenberg were American citizens who were accused and convicted of spying on behalf of the Soviet Union.