In fact, the Palmer Raids were triggered by a massive domestic campaign of terror conducted by anarchist organizations. It involved a hundred mail bombs and an attempt to blow up the Attorney General of the United States (Mitchell Palmer) and J.P. Morgan among others. One anarchist bombing killed 40 people the biggest terrorist atrocity in American history until then. Another plot -- to poison 200 members of the Archdiocese of Chicago who were attending a dinner party -- failed when the guests only became sick.Anarchists suck. And their violence started a few decades before 1920 if I recall...