While Gedeon initially remained active in Germany's anti-nuclear and peace movement as a member of the International Physicians for the Prevention of Nuclear War (IPPNW), he gradually turned to pendulum dowsing and other esoteric practices.

[3] Gedeon, who is associated with the party's hard right wing,[4] entered the Baden-Württemberg parliament in the state's 2016 regional election,[5] where the AfD received a record result of 15.1% from scratch.

Gedeon was accused of blaming Jews for antisemitic resentments in his 2012 book Der grüne Kommunismus und die Diktatur der Minderheiten ("Green Communism and the dictatorship of minorities"), where Gedeon suggests that "Jews themselves brought about sufficient justification for the hostilities they had to face,"[7] a line of reasoning that the critic at Amadeu Antonio Foundation considered one of the most perfidious while also most common antisemitic patterns.

[9] Frankfurter Allgemeine Zeitung learned that Gedeon considers the convicted neo-Nazi Holocaust deniers Horst Mahler and Ernst Zündel as mere "dissidents", an assessment he repeatedly voiced in both works, which were all printed by German vanity publisher R. G.

[10] AfD Baden-Württemberg's vice chair Marc Jongen confessed in the German New Right's newspaper Junge Freiheit that Gedeon's Leitkultur trilogy made him shiver the more he studied it, summarizing that Gedeon sees the influence of Judaism behind every intellectual or political step that helped build the modern world with its secular Rechtsstaat, democracy and liberal market economy, and its free and mature citizens.

Gedeon literally denigrates all of these achievements as manifestations of "individual or general societal degeneration", or a regression behind Christendom which he considers as "essentially antijudaistic."