Intolerance in America that targets alleged internal subversives controlled by external agents has a storied history that stretches hundreds of years. While the post-World War II "Red Scare" and the emergence of McCarthyism during the 1950s is the era commonly associated with American anticommunism, there was also a "First Red Scare" that occurred in 1919-1920. In both time periods, many Americans feared the radicalism of the left, and some of the most outspoken--like McCarthy--used slander to denounce their political enemies. The result was an atmosphere in which individual rights and...