Wüppesahl was a founder of a pressure group against Krümmel Nuclear Power Plant in Geesthacht 1975.

In 1990 he criticized the procedure of the German reunification gave no participation in the process to the population in Eastern Germany.

In October 2004, Wüppesahl was arrested on information by a friend and accused of planning a bank robbery and murder.

[8] Wüppesahl argued his intention had been to uncover the former policeman observing him as an unofficial police spy what he was obviously.

[10] On 27 July 2013 Imtech announced that a criminalist officially named as "Mr. Y" had been consulted in 2011 to investigate the corruption in the reconstruction of the twin towers in Frankfurt.

He identified more than he should; he warned the company in his final report in May 2011 about mafia structures and he charged the manager of the German subsidiary, Klaus Betz.