I don't know the answer to your question, but do remember him as a perpetual trouble maker who caused a lot of bad will toward Jews. In my view, that was not a good thing. The JDL was, in his time, a very militant organization. I have heard nothing of it for years until today.
FYI, JDL is representing the American POW's from WWII who were imprisioned and tortured by the Japanese. Many were tortured to DEATH. JDL is representing their families!