31 October 1879~ 22 December 1941 Larger Prev Next Loading images... Karel Hašler  (31 October 1879,  Prague  – 22 December 1941,  Mauthausen ) was a  Czech  songwriter, actor, lyricist, film and theatre director, composer, writer, dramatist, screenwriter and cabaretier. He was murdered in the Mauthausen concentration camp Karel Hašler in one