McCarthy launched his career as a 'Red-baiter' in February 1950, when he alleged in a speech that there were no less than 205 communists in one of the Federal Government's departments. Which department was this?

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.