The 43 Group was an English anti-fascist group set up by Jewish
     ex-servicemen after World War II. They did this when, upon returning
     to London, they encountered British fascist organisations such as
     Jeffrey Hamm's British League of Ex-Servicemen and later Oswald
     Mosley's new fascist party, the Union Movement. The activities of
     these fascist groups included antisemitic speeches in public places,
     and from the rank-and-file fascists, violent attacks on London Jews
     and Jewish property.[1] Group members broke up far-right meetings,
     infiltrated fascist groups, and attacked the fascists in street
     fighting.[2]

   [1]https://en.wikipedia.org/wiki/43_Group
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References

   1. https://en.wikipedia.org/wiki/43_Group