Juggaknots - Clear Blue Skies
J-Zone - Inauguration Day
J-Live - Satisfied?
Lone Catalysts - X-Tinction
Masterminds - Step By Step (F/ Murs)
Ras Kass - Nature Of The Threat
The Coup - Get Up (F/ Dead Prez)

Pretty much ANY song by Dead Prez or Public Enemy

Songs about police brutality towards Blacks:

Blahzay Blahzay - Good Cop / Bad Cop
Jeru The Damaja - Invasion
KRS-One - Sound Of The Police
Brand Nubian - Probable Cause
Cocoa Brovaz - No Justice, No Peace

yea go with dead prez, theyre racist as fuck and its really funny

Southern Man
Neil Young

A sample of the lyrics by the group 'Niggers With Attitude' will most probably get you an A*