Political speeches - correct, and incorrect - in Invisible Man

The "radical" section of Ralph Ellison's Invisible Man may seem a little dated today, but for anyone familiar with leftist-progressive groups of the 60s and 70s Ellison's account of this band of "brothers" that recruits the Invisible Man to be their lead speaker at public rallies and demonstrations seem very true, real, and hilarious - though I suspect it will lead to a less-than-hilarious denouement. The activists come upon the IM when he speaks impromptu to a group gathered in Harlem to rail against an eviction; after brief introductions to their leadership team - primarily, their wealth East Side benefactors, a bitter and ironic contrast w/ the white benefactors of the IM's college - they bring him to speak at a rally. The IM gives an impassioned from the heart speech, modeled on the church sermons he knew as a child, and he totally rouses the Harlem crowd. Then the group leaders engage in a critique session - how true that is! - in which after initial hesitations a few of the "brothers" express their contempt for his speech: we shouldn't stir their passions, we should reason with the audience, win them over to action through logical argument. Well, it's obvious why this is a fringe group and why they need someone like the IM - even though they are jealous of his charisma and, in fact, a little afraid of the passions he can stir (and with good reason - these passions can so easily turn to fascism, a fact not all that far removed from Ellison at the time he was writing - late 40s early 50s). I love in particular when one of the brothers gives the ultimate term of damnation to the IM's speech: it was "incorrect." Politically incorrect has a different connotation today, but in the 20th century it seemed to derive from the idea that leftist politics was scientific and that a speech or action that deviated from accepted theory was "incorrect" in the same way that a solution to math problem could be incorrect. Their solution: several months of training and study for the IM before he's permitted to speak in public again. Wonder how that'll turn out.