A more thorough explanation:

The McCarran Internal Security Act is a federal law that was passed in 1950 during the Cold War. It required members of the Communist party to register with the Attorney General and for Communist organizations to provide the government with a list of members. The law was not fully repealed until 1993, but various portions of it were declared unconstitutional by the U.S. Supreme Court over the years.

An example of the McCarran Internal Security Act in action is when a member of the Communist party had to register with the Attorney General. This meant that the government could keep track of who was a member of the party and potentially monitor their activities.

The McCarran-Ferguson Act is a federal law that allows states to regulate insurance companies doing business in that state and to levy a tax on them. This law helps to ensure that insurance companies are following state regulations and that they are contributing to the state's economy through taxes.

An example of the McCarran-Ferguson Act in action is when a state regulates an insurance company's rates and policies. This means that the insurance company must follow the state's rules and regulations, which can help to protect consumers and ensure fair business practices.