On Feb. 1, 1960, four young black students sat at the whites-only Woolworth lunch counter in Greensboro, N.C., where they were refused service by staff and heckled by patrons. By fall, sit-ins spread to more than 100 Southern cities and historians estimate that as many as 100,000 participated in the non-violent protest. These couragous acts continue to inspire the anti-hate movement today.