She was 1968 the first female chairwoman of the Allgemeinen Studierendenausschuss (AStA) at Free University of Berlin and was involved in South America during the political upheavals of the 1970s.

They wrote articles on fascism and sexuality, read and discussed texts by Max Horkheimer and Hannah Arendt, reviewed books and published in the journal Das Argument.

[1] In 1965, Fronius joined the Sozialistischer Deutscher Studentenbund (SDS), ran for a seat in the Students' Parliament, was elected and in 1966 was appointed university officer of the AStA.

Study-oriented working groups were formed at the faculties, which – with the active participation of Fronius – led to the founding of the Critical University [de].

[12] Over time, the men increasingly spoke of their claim to leadership, which eventually prompted Fronius to separate from the group and return to her studies.