In the early 1970s, the first news about the Stonewall riots by American LGBT people against police brutality filtered through to Europe. This particularly inspired and mobilised young, left-wing LGBT people. In 1970, Rosa von Praunheim showed his film «Nicht der Homosexuelle ist pervers, sondern die Situation, in der er lebt» ("It's not the Homosexual who is perverse, but the situation in which he lives") at the universities of Zürich, Basel and Bern. Following the screenings, the LGBT groups in Zürich ("HAZ"), Basel (initially called "HAB", then "HABS") and Bern ("HAB") were established. Politically, the HA groups were close to the Marxist–Leninist PO-groups.