Klaus Viehmann spent fifteen years in West German prisons after his arrest in 1978 for various activities carried out by the anarchist 2nd of June Movement. While in prison he wrote an essay that became the centerpiece of the book Drei zu Eins (''Three to One''), published in 1991. The book introduced the concept of ''triple oppression''--the interrelations between class, gender and race in oppressive social structures--to a radical German-speaking audience, and proved highly influential, especially in autonomist circles. Since his release Viehmann has been active in various left-wing projects, including solidarity campaigns for World War II forced laborers and Colombian trade unionists. He remains involved in numerous publishing activities, as an author, translator, and a graphic designer. He is also co-editor of two extensive volumes documenting the history of autonomist political poster art in Germany; Hoch die Kampf Dem (1999) and Vorwrts bis zum Nieder Mit (2001). His home is once again Berlin--today officially undivided, but, as he puts it, ''a place where a lot needs to be done.''