Question: Otto Muehl was a main participant in what short and violent 20th-century art movement?
Sentence (from "Otto Muehl"): Otto Muehl (16 June 1925 – 26 May 2013) was an Austrian artist, who was known as one of the co-founders as well as a main participant of Viennese Actionism and for founding the Friedrichshof Commune.
Relevant evidence: Yes