The last castle question?

what is the song playing when thumper. (the african american with a orange beanie) get shot? therey'll telling him to get down and he won't so the guy tells zamporon or w/e to shoot him and there is thi song playing and from what i heard goes something/ or somewhat like this. "they don't know to keep us down, sound off" then he shoots thumper. i wanna know what song that was?