He was the leader of the German Freedom Party from 2013 to 2016, and has been active for many years with his public speaking and protests against Islam with groups such as the Citizens' Movement Pax Europa and Pegida.

He is an active YouTuber and contributor to the blog Politically Incorrect,[1] and was observed by the Bavarian Office for the Protection of the Constitution for anti-constitutional extremism from 2013[2][3] until 2022.

[8] Stürzenberger joined the Christian Social Union in Bavaria (CSU) in 2003, and briefly served as its press spokesman in Munich under Monika Hohlmeier until 2004.

[13] He had previously been relieved of his positions in the party after a blog post that called for Muslims to be forced to leave the country unless they renounced their faith.

[19] In September 2014, Stürzenberger stated to have collected 60,000 signatures against the Islamic centre of Imam Benjamin Idriz, far more than the 34,000 that was necessary to initiate a referendum in Munich.

[23] During his rallies, he faced physical attacks, including one incident on October 23, 2013, where his glasses were broken and he sustained minor injuries from a 34-year-old Munich resident of Turkish origin.

[32] In May 2013, Stürzenberger was acquitted for the charge of having shown a poster with an image and quote of Heinrich Himmler at a demonstration to prove the similarity between Nazism and Islam.