He thus began an intensive study of African–American history while in prison, reading books such as The Autobiography of Malcolm X. He also devoured works by writers such as J. A. Rogers, Erich Fromm, Friedrich Engels, Karl Marx, and Vladimir Lenin.
He then trained in psychoanalytic psychotherapy at the Washington School of Psychiatry, and in the clinical and research methods of the psychoanalyst Erich Fromm.
At Bennington and through field experiences at Chestnut Lodge, a private psychiatric facility, she studied psychological issues with Erich Fromm, Frieda Fromm-Reichmann, and Harry Stack Sullivan.
In The Sane Society, published in 1955, psychologist Erich Fromm proposed that, not just individuals, but entire societies "may be lacking in sanity".
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The Frankfurt School is the name usually used to refer to a group of scholars who have been associated at one point or another over several decades with the Institute for Social Research of the University of Frankfurt, including Theodor W. Adorno, Max Horkheimer, Ernst Bloch, Walter Benjamin, Erich Fromm, Herbert Marcuse, Wolfgang Fritz Haug and Jürgen Habermas.
When Adolf Hitler rose to power in Germany and Jews began to be persecuted, Frieda moved to France and then later to the United States where her husband Erich Fromm, from whom she had long been separated, got her a job as a psychiatrist at Chestnut Lodge, a mental hospital in Maryland.
The second group of mass society theorists, those who emphasized social disintegration and the quality of participation, was best represented by Emil Lederer, Erich Fromm, and Sigmund Neumann.
In different interviews 020 / Tangocrisis acknowledged several influences within and outside the music industry in their lyrical content, such as Pink Floyd, The Clash, Bob Marley, Erich Fromm, Aldous Huxley and George Orwell.