Radicals!

The June 1967 visit of the Shah of Iran to West Berlin. And the indiscriminate police brutality against the student demonstrators was the catalyst that further radicalized the students. Peter, Karla, Klaus, and Olga were there and they suffered from police violence. In the aftermath, the West Berlin police banned demonstrations, it forced radical students to break the law to demonstrate.
Karla is the daughter of Communist resistance member and she is inspired by the courage of her parents. Karla wants to achieve her doctorate. Her involvement in the radical student movement might mean she doesn't get it.