Black Hebrews. Theres several thousand of them in Israel. Odd folks indeed.
I think most of them are from Ethiopia, which is one of the places Jews went in the Diaspora. Mixed Semetic and native black (not exactly the same as blacks you see in the USA -— facial features are very distinct — black skin, but lack the flattened nose).
They do practice Judaism, and as their kids go through the IDF, have Orthodox Conversions, so they are, indeed, Jewish.
Black Hebrews (in this case) refers to mostly-American members of a cult. They are not related to Ethiopian Falashmura or Beta Israel.
More thn a few are in the Israeli Police Reserves, the Mash'az armed police reserve, as well.