Song of Solomon by Toni Morrison.
The Seven Days is a fraternal society of Black men. Their purpose is to respond with militancy when a Black person is murdered by a white person and the crime goes unpunished.
“If the Negro was hanged, they hang; if a Negro was burnt, they burn; raped and murdered, they rape and murdered... It's about trying to make a world where one day white people will think before they lynch”

Days 1-3 of The Seven Days.

Days 4, 5, and 6 of The Seven Days

Day 7 of the Seven Days with her witness