Anti-Communist investigators drew up 'blacklists' of suspects, including one of 300 people in the entertainment industry. In which part of the industry were they said to be working?

There had been a previous 'Red Scare' in the USA just after the Great War. The fear of Communism that swept the country after the Second World War was more serious. From 1950 to 1954 Senator Joseph McCarthy (after whom McCarthyism is named) conducted a powerful campaign against alleged Communists at the heart of the American government.