German Interior Minister Horst Seehofer outlawed biker group Osmanen Germania BC (Germania Ottomans) on Tuesday, banning them from all activity.
"The club presents a serious danger for individual legally protected rights and for the general public," the ministry said in a statement.
The announcement came as police carried out raids on Osmanen Germania in the states of Rhineland-Palatinate, Baden Württemberg, Bavaria and Hesse. Authorities estimate the group has 300 members across the country.
Seehofer said the ban, which affects 16 club chapters, was part of a state and federal crackdown on organized crime.