Poster advocating the release of Karl Armstrong, who was incarcerated for his involvement in the 1970 Sterling Hall bombing on the University of Wisconsin-Madison campus. Features the words, "Free Karl" over an image of a flame. Caption at bottom reads, "Karl Armstrong is a prisoner of war charged with the bombing of the A.M.R.C., a military research center in Madison, Wisconsin. Please send contributions to the Karl Armstrong Defense Comm., c/o Madison Defense League, Box 1134, Madison, Wis. 53700."
Army Math Bombing Wiki
From a collection of over 100 posters collected in the 1970s at the University of Wisconsin, Madison.