In “Last Man Standing,” subtitled “Suge Knight and the Murders of Biggie & Tupac,” the British documentarian Nick Broomfield tries to tie up loose ends from his “Biggie and Tupac” (2002).

As a Japanese-American kid growing up in Los Angeles, Glenn Kaino was drawn to the image of Tommie Smith and John Carlos standing with arms raised on the podium of the 1968 Olympics in Mexico City ...