
I actually study this: post wwii you started seeing a drop in antisemitism while anti black racism was still going strong. Jews got to benefit from their white adjacent status and were climbing up socially and economically and this created a rift in the politics of the communities when before they had been more aligned
I think a particular aspect of both the Asian and Jewish dynamic is that both groups are very often business owners, and that contributes to further tension when those businesses are operating within black communities. You can look up a term: Middleman Minority. It is common for animosity to go towards ethnic groups who tend to operate as merchants or similar roles.
Black Americans started supporting more militant factions like the black panthers whereas Jews were more invested in preserving the liberal order. These rifts also led to an increase of antisemitism in the black community a la Nation of Islam which only widened the gaps in the communities as both saw the other as potentially hostile