- The Alien Registration Act passed by Congress on 29th June, 1940, made it illegal for anyone in the US to advocate, abet, or teach the desirability of overthrowing the government. The law also required all alien residents in the US over 14 years of age to file a comprehensive statement of their personal and occupational status and a record of their political beliefs Within four months a total of 4,741,971 aliens had been registered.
- Jullius Rosenberg (1918 – 1953) and Ethel Greenglass Rosenberg (1915 – 1953) were American citizens who received international attention when they were executed after having been found guilty of conspiracy to commit espionage in relation to passing information on the American atomic bomb to the Soviet Union.
- Red Scare
- Senator Joseph McCarthy
- Accused many of being communist spies
- Began a reign of fear and paranormal in American society
- Even accused government officials of being communists
- Dominated US politics from 1948-1953
- Senator Joseph McCarthy