First of my favorites include:
MLK, Jr.
I feel that his movement was the more successful (but I do not mean to compare).
I used to love the Black Panthers more, but I feel that MLK, Jr. is misunderstood a lot more, and lately have been reading more about him.
I think that he can show how to broaden a working-class movement and he managed to get anti-communist labor on his side (even as he courted communist or former communist figures). He's a lot more leftist than a lot of people give him credit for, though was arguably a lot more low-key about it. Ultimately, he was killed for uniting various forces together and creating a brewing "unity of action" (an old Marxist-Leninist term that I wish more people would study). I don't believe what scandal journalists say about him and I'm reluctant to give them any credence, though I heard a lot about it growing up. Jack O'dell also deserves some praise; he was considered the fifth worst communist in the United States by JFK (or maybe that was Herbert Aptheker lol); a lot of things were said about him for being an advisor to the various campaigns by MLK, Jr.
Oh yeah, regarding the Black Panthers, my two favorites are:
Huey Newton
and
Freddie Gray
(that last one is just a basic opinion and kinda trite at this point, but I know that Huey Newton gets flack for his later years, which I don't agree with)
I think a movement combining the radicalism of the Black Panthers and the more broader and unified movement of MLK, Jr. and the various people that worked with him would be a good development and we need that more than ever, a movement that can win "concessions" while still sticking to its guns and creating dual power structures.