according to mainstream Talmudic doctrine, black Africans are traditionally placed somewhere between people and monkeys in their intrinsic nature, and surely all rabbis, even liberal ones, would be aware of this religious dogma. But Shahak notes that the numerous American rabbis who so eagerly worked with Martin Luther King, Jr. and other black Civil Rights leaders...

strictly concealed their religious beliefs while denouncing American society for its cruel racism

https://www.unz.com/runz/american-pravda-oddities-of-the-jewish-religion/