As Bernie Sanders’ American presidential hopes fade amid Joe Biden’s march to victory in the Democratic primaries, so, too, does his dream of a people’s “revolution” in the United States. The R-word has popped up frequently at Sanders rallies. Indeed, Our Revolution is both the title of the book Sanders wrote in 2016, as well as the name of the political-action organization his campaign inspired. The revolution that Sanders speaks of is a democratic, populist process leading to (as his book’s subtitle had it) “a future to believe in.” But Sanders’ own personal history shows that he was, and remains, naively sympathetic to some of the most ruthless revolutionary movements of the 20th century. Earlier this month, the New York Times reported that in the late 1980s, while mayor of Burlington, Vermont, Sanders made friendly overtures to his counterpart in the Russian city of Yaroslavl. According to Soviet-era documents inspected by the Times, this outreach was leveraged by Soviet officials to further a propaganda campaign intended to “reveal American imperialism as the main source of …