Fromm, Marcuse, and Zizek represent distinctive but still related experiments by middle-class radical intellectuals to synthesize psychoanalysis and Marxism. Fromm, a practicing psychoanalyst, laid the foundation for Freudo-Marxism at the Frankfurt School. Marcuse, a left-Heideggerian philosopher with no training in psychoanalysis, adopted Freudo-Marxism in opposition to Fromm's rejection of libido/drive theory. Zizek, who has links to Heidegger and Marcuse, is a philosopher in the Freudo-Marxist tradition, specifically, Lacanian-Marxism. What is notable in all three cases is the degeneration of the experiment to synthesize psychoanalysis and Marxism, and its collapse into forms of subjectivism.