As Gerard Alberts has brought to our attention, in the late nineties, there was a HM-thread on B. with the same question. You may wish to take a look at:
Now, the letter you have seen in the archive of the ETH (Zurich) that B. wrote to Heinz Hopf in 1946 (in which he tries to "explain" his attitude towards Jewish mathematicians during the war and in which he expresses some regret) seems to agree with an interview with B. by van Dalen, where B. makes no attempts to deny his political past (DvD-JGC, private correspondence).
All the best, Julio GC
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