[1] A former local Berlin state representative for the Christian Democratic Union (CDU) and anti-Islam activist, he co-founded the German Freedom Party in 2010, which he led until 2013.

[3] Stadtkewitz became a member of the Christian Democratic Union (CDU) in 1995, and represented the party locally in the state parliament of Berlin[4] from 2001 to 2010.

In three letters he was told that "the family would be at risk" if he did not give up his opposition to the construction of the Khadija Mosque and did not resign his mandate as a member of parliament.

At the closing rally of the demonstration on 11 July 2007, he gave a speech in which he described Islam as a "political religion" that "cannot be integrated into Europe".

[8] Stadtkewitz was expelled from the CDU in 2010 after inviting Dutch anti-Islam politician Geert Wilders to hold a speech.

[1] The same year he was part of an initiative with international politicians Heinz-Christian Strache, Kent Ekeroth and Filip Dewinter in Jerusalem that declared their support for Israel against Islamic terrorism.