Meatpackers march June 12, 2000, from United Food and Commercial Workers union hall in St. Paul, Minnesota, to Dakota Premium plant gate in fight that won union recognition. Communists “have no interests separate and apart from those of the proletariat as a whole,” wrote Karl Marx and Frederick Engels in the Communist Manifesto. “They do not set up any sectarian principles of their own, by which to shape and mold the proletarian movement.”