Johann Wolfgang Goethe University Frankfurt am Main

The University of Frankfurt has always been considered liberal, or left-leaning, and has had a reputation for Jewish and Marxist scholarship (or even Jewish-Marxist). Thus, during Nazi times, "almost one third of its academics and many of its students were dismissed for racist and/or political reasons - more than at any other German university." (University homepage) It also played a major part of the German student riots of 1968.
The University of Frankfurt is best known for the Institute for Social Research (founded 1924), institutional home of the Frankfurt School, one of the most important 20th century schools of philosophy and social thought at all. The most famous University of Frankfurt scholars are associated with this school, including Theodor Adorno, Max Horkheimer, and Jürgen Habermas, as well as Herbert Marcuse, Erich Fromm, and Walter Benjamin. Others include the sociologist Karl Mannheim, the philosopher Hans-Georg Gadamer, the philosophers of religion Franz Rosenzweig, Martin Buber, and Paul Tillich, the psychologist Max Wertheimer, and the anthropologist Norbert Elias.