Although Jung had many friends and respected colleagues who were Jewish, there were allegations that he was a Nazi sympathizer. Jung was editor of the Zentralblatt für Psychotherapie, a publication that eventually endorsed Mein Kampf as required reading for all psychoanalysts. Jung claimed it was done to save psychoanalysis and preserve it during the war, believing that psychoanalysis would not otherwise survive, because the Nazis considered it to be a "Jewish science." He also claimed he did it with the help and support of his Jewish friends and colleagues. This after-the-fact explanation, however, has been challenged on the basis of available documents. There is another school of thought: that Jung wrote the article for the journal, and the reference of Mein Kampf was added after the article had been submitted.
On the other hand, there are writings that show that Jung's sympathies were against, rather than for, Nazis. He voiced his opinions about Hitler and stated that the situation of the crazy passion was becoming dangerous.
Jung served as president of the Nazi-dominated International General Medical Society for Psychotherapy, created by Matthias Göring. One of his first acts as president was to modify the constitution so that German Jewish doctors could maintain their membership as individual members even though they were excluded from all German medical societies. In 1934, when he presented his paper "A Review of the Complex Theory" in his presidential address, he did not discount the importance of Freud and credited him with as much influence as he could possibly give to an old mentor. Later in the war, Jung resigned.
In addition, in 1943 he aided the U.S. Office of Strategic Services by analyzing the psychology of Nazi leaders. See also ongoing discussion in relation to "post-Jungian" interpretation.
In an interview with Carol Baumann in 1948, published in the Bulletin of Analytical Psychology Club of New York,...