What Was 'Weather Underground' Militant Group?

Weather Underground, also called Weather Underground Organization, formerly Weatherman, militant group of young white Americans formed in 1969 that grew out of the anti-Vietnam War movement. The Weather Underground, originally known as Weatherman, evolved from the Third World Marxists, a faction within Students for a Democratic Society (SDS), the major national organization representing the burgeoning New Left in the late 1960s. Members of the Weather Underground sought to advance communism through violent revolution, and the group called on America's youth to create a rearguard action against the U.S. government that would bring about its downfall.