Original: Fischer was a leader in several street battles fought by the radical Putzgruppe (literally "cleaning squad", with the first syllable being interpreted as an acronym for Proletarische Union für Terror und Zerstörung, "Proletarian Union for Terror and Destruction") which physically attacked a number of police officers.
Simplified: Proletarische Union für Terror und Zerstörung, i.e. The Workers Union for Terror and Destruction).