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There is no historical record of how hard Schwartz’s mind was blown when he learned that Betty Falco, née Broder, was Jewish, and that Berkowitz’s birth father was not Tony Falco, but a Jewish guy named Joseph Kleinman. There was no disowning David Berkowitz, something Jews had to live with until 1987, when Berkowitz became a born-again Christian in prison.
https://forward.com/culture/428906/why-son-of-sam-was-bad-for-the-jews-in-1977/