The McCarran internal security act made it unlawful to plan any action that might lead to the establishment of a dictatorship in the US?

The McCarran Internal Security Act, enacted in 1950, aimed to protect national security by making it unlawful to engage in activities that could lead to the establishment of a totalitarian regime in the United States. It required organizations deemed subversive to register with the government and allowed for the detention of individuals suspected of threatening national security during emergencies. The act reflected the heightened fears of communism during the Cold War, but it was criticized for potentially infringing on civil liberties and free speech.