of course a lot of "free" musicians were deeply entrenched in the idea that free music or out music was in fact a radical expression of their Blackness

AEC (Great Black Music), Shepp, Rev Ensemble, Frank Lowe, etc

i think Free Jazz in some way had to have a connection w/ the radicalism & exploration of the zeitgeist of that era & jazz being inherently Black music reflected that in both the left leaning free movement as well as the artists that delved more into soul/funk to reflect the desires of "the people" so to speak