Angela Davis from the cover of International Times #132 (May 1972). Artist unknown.
This is a cool graphic from an old UK magazine that I cleaned up a bit to remove the streaks and whatnot though I kept the color scheme. Since the image is so amazingly cool, I expect this graphic or a similar knock-off to start showing up on the racks in those nationwide t-shirt and novelty crap emporiums in about a week to be worn by the same type of person (albeit female) who wear those Che Guevara shirts without knowing or understanding what the imagery symbolizes.
Before you give that store at the mall any of your money read up a bit about Angela.