Psy-sciences (psychology, psychiatry, psychoanalysis, pedagogy, criminology, special education, etc.) have been connected to politics in different ways since the early twentieth century. Here in twenty-two essays scholars address a variety of these intersections from a historical perspective. The chapters include such diverse topics as the cultural history of psychoanalysis, the complicated relationship between psychoanalysis and the occult, and the struggles for dominance between the various schools of psychology. They show the ambivalent positions of the psy sciences in the dictatorships and authoritarian regimes of Nazi Germany, East European communism, Latin-American military dictatorships, and South African apartheid, revealing the crucial role of psychology in legitimating and normalizing these regimes. The authors also discuss the ideological and political aspects of mental health and illness in Hungary, Germany, post-WW1 Transylvania, and Russia. Other chapters describe the attempt by critical psychology to understand the production of academic, therapeutic, and everyday psychological knowledge in the context of the power relations of modern capitalist societies.