Otto Muehl was a main participant in what short and violent 20th-century art movement?
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. Viennese Actionism: Viennese Actionism was a short and violent movement in 20th-century art.
Viennese Actionism