Demonstrations organized by the Weather Underground known as the Days of Rage began in Chicago, aimed at ending U.S. involvement in the Vietnam War.

The Weather Underground was a far-left Marxist militant organization first active in 1969, founded on the Ann Arbor campus of the University of Michigan. Originally known as the Weathermen, or simply Weatherman, the group was organized as a faction of Students for a Democratic Society (SDS) national leadership. Officially known as the Weather Underground Organization (WUO) beginning in 1970, the group's express political goal was to create a revolutionary party to overthrow the United States government, which WUO believed to be imperialist.

The Days of Rage were a series of protests during three days in October 1969 in Chicago, organized by the emerging Weatherman faction of Students for a Democratic Society (SDS).

Opposition to United States involvement in the Vietnam War began in 1965 with demonstrations against the escalating role of the United States in the war. Over the next several years, these demonstrations grew into a social movement which was incorporated into the broader counterculture of the 1960s.