The Sexual Revolution (1936). His work on character contributed to the development of Anna Freud's The Ego and the Mechanisms of Defence (1936), and his idea of muscular armour – the expression of the personality in the way the body moves—shaped innovations such as body psychotherapy, Fritz Perls's Gestalt therapy, Alexander Lowen's bioenergetic analysis, and Arthur Janov's primal therapy. His writing influenced generations of intellectuals: during the 1968 student uprisings in Paris and Berlin, students scrawled his name on walls and threw copies of The Mass Psychology of Fascism at the police. Critical Theory Frankfurt School The Frankfurt School, from the Institute for Social Research, took up the task of choosing what parts of Marx's thought might serve to clarify social conditions which Marx himself had never seen. They drew on other schools of thought to fill in Marx's perceived omissions. Max Weber exerted a major influence, as did Freud. In the Institute's extensive (ed. Max Horkheimer, Paris 1936), Erich Fromm authored the social-psychological part. Another new member of the institute was Herbert Marcuse, who would become famous during the 1950s in the US. Herbert Marcuse Eros and Civilization is one of Marcuse's best known early works. Written in 1955, it is an attempted dialectical synthesis of Marx and Freud whose title alludes to Freud's Civilization and its Discontents. Marcuse's vision of a non-repressive society (which runs rather counter to Freud's conception of society as naturally and necessarily repressive), based on Marx and Freud, anticipated the values of 1960s countercultural social movements. In the book, Marcuse writes about the social meaning of biology – history seen not as a class struggle, but fight against repression of our instincts. He argues that capitalism (if never named as such) is preventing us from reaching the non-repressive society "based on a fundamentally different experience of being, a fundamentally different relation between man and nature, and fundamentally different existential relations". Erich Fromm Erich Fromm, once a member of the Frankfurt School, left the group at the end of the 1930s. The culmination of Fromm's social and political philosophy was his book The Sane Society, published in 1955, which argued in favor of humanist, democratic socialism. Building primarily upon the works of Marx, Fromm sought to re-emphasise the ideal of personal freedom, missing from most Soviet Marxism, and more frequently found in the writings of classic liberals. Fromm's brand of socialism rejected both Western capitalism