Summarize the causes and effects of McCartyism

Some of the causes to McCarthyism was World War 1, The Bolshevik Revolution in Russia, and Self-proclaimed anarchists' mailing bombs to prominent Americans. Some of the effects were that Millions of Americans were forced to take loyalty oaths, Activism and labor unions goes into decline, Many people become afraid to speak out on public issues, and Anti-communism continues to drive foreign policy.