Four photographs

Birmingham, Alabama, May 3, 1963.AP Photo by Bill Hudson. 
(Click all images to enlarge)




Ferguson, Missouri, Aug. 11, 2014.Photo by Whitney Curtis for the New York Times. 




Tiananmen Square, June 5, 1989.
AP Photo by Jeff Widener.




Ferguson, Missouri, Aug. 13, 2014.Photo by Mario Anzuoni/REUTERS.