Twenty years ago in NYC they had brawls between those 2 groups at job sites, where they knew contracts required the workers were 51% minority or women; both groups would show up, knowing that a certain number of either had to be hired, and they would brawl over who was going to do nothing & collect a check while the white people did the work.
I have heard that the “leadership” of the two groups have entered into written treaties designed to promote their mutual interests at the expense of whites. I do not know if it is true, as to written treaties, but they do seem to support each other politically at the expense of others. However, I do see reports that at the neighborhood level the two groups do not get along; “a falling out among thieves,” if you will!