By now many have seen the video of an unidentified man punching white nationalist Richard Spencer in the face during inauguration weekend.Much in the way that the new president's vicious campaign rhetoric gave voice to the deeper resentments of some of his supporters, the assault on Spencer seems to have offered a cathartic and even comedic outlet for those on the left who were angered by thoughts of Trumpians goose-stepping through the streets of DC as Trump entered the White House. ...

This beef goes back to before World War II, when in Europe, a nascent authoritarian movement inspired by Hitler, Mussolini, and Francisco Franco squared off against a popular front coalition of liberals and radicals. At the Battle of Cable Street, in October 1936, Oswald Mosley brought 2,000 members of his British Union of Fascists to march through London's Jewish East End neighborhood and 100,000 anti-fascists showed up to oppose them. In the resulting melee, Jews, Irishmen, Communists, anarchists, and socialists beat Mosley's men with sticks, rocks, and sawed-off chair-legs. Local women dumped their chamber pots out of windows onto the heads of Mosley's men.

Similar conflicts played out several decades later in America. In 1979, in Greensboro, North Carolina, the Communist Workers Party organized a rally called "Death to the Klan." TV crews filmed as a nine-car caravan of Klansmen and neo-Nazis suddenly showed up and shot at marchers, murdering five participants, though no one was ever convicted of the crime. (In 2014, one self-proclaimed participant, Frazier Glenn Miller, went on a shooting spree at a Jewish cultural center in Kansas, murdering three people. The 74-year-old had just been diagnosed with lung cancer; he said that he "wanted to make damned sure I killed some Jews or attacked the Jews before I died.")