Answer:
required communist organizations to register with the government.
Step-by-step explanation:
McCarran Internal Security Act of 1950, often referred to as the Subversive Activities Control Act of 1950.
The name of the act was given after its principal sponsor Sen. Pat McCarran, it is a United States federal law, that required any Communist organizations to register with the United States Attorney General and established the Subversive Activities Control Board, that will carry out investigation on any persons suspected of engaging in subversive activities or promoting the establishment of a "totalitarian dictatorship," either as a fascist or communist.
Hence, the right answer is The McCarran Internal Security Act required communist organizations to register with the government.