That is the new, excellent, and timely book by Hollis Robbins, the title is descriptive, here is one excerpt:
“If We Must Die” calls for resistance to violence in an environment of violence. The power of [Claude] McKay’s sonnet—Shakespearean and yet with modern diction—is the tension between the measured lines and rhyme, the poetic phrases and the brutal words, the combination of enjambments and exclamation points in the octave, and the more deliberate and determined pace of the sestet. “If We Must Die” is a defiant call to action. The rage of the poem is made more potent by the tension of the sonnet form straining to contain it.
The book argues for the centrality of sonnet writing to African American poetry, and that the African American tradition was not simply parasitic on European models. A “sestet,” by the way, is the last six lines of a sonnet, but not a good Scrabble word because you have to waste two “s’s” to play it.