> There was a great deal of support for Jim Crow among northern
> capitalists, no?
The Republicans - who basically represented Northern capital - were for the most part quite in earnest about enforcing the voting rights of Southern blacks. Jim Crow is the name given to the system that came into existence after the disenfranchising state Constitutional conventions of 1896-1904. Most of those conventions were called in response to the very real threat of the Republicans' passing the Federal Elections Bill to enforce voting laws with federal troops. The bill was shepherded and championed by Henry Cabot Lodge.
Just a few minutes ago I read in Theodore White's 1964 "Making of the President" that Nelson Rockefeller not only donated $10,000 to Martin Luther King while he was running for president, but also arranged a $20,000 loan to SNCC. He was honoring his abolitionist heritage. There was a lot of that kind of stuff.
On the other hand, most capitalists, like always, probably cared mostly about making money, not about other societies' human rights issues.
SA