In 1950, Wisconsin Senator Joseph McCarthy used fear-mongering in the Cold War to master the art of the Big Lie. In 2016, Donald Trump used fear-mongering to master the Tweet. Both were, and are, dangerous.
McCarthy entered the United States Senate in 1947, and by all accounts was a lazy, careless, slovenly representative. Half way through his first term, he decided he should do something that would ensure his re-election. Seeing that California Senator Richard Nixon had won fame tracking Communists, McCarthy thought he would emulate Nixon and become a Red Hunter.