During the late 1940’s and early 1950’s conservatives in Congress, and in the Truman and Eisenhower administrations, conducted hearings and investigations aimed at rooting out Soviet agents in the federal government. This campaign was widely supported by the general public at the time. Today college professors and other leftists refer to the hunt for Communist spies as “McCarthyism,” and the public support for it as “anticommunist hysteria.”
The part of this story that you won’t learn in college is that there actually were many Soviet spies in the government before and during the “McCarthy Era,” and that “McCarthyism” forced many of these enemy agents out of the government.