(source, picture by Warren K. Leffler)
The picture, taken in 1963, shows Governor George Wallace attempting to block integration and desegregation at the University of Alabama by the enrollment of black students. He is standing defiantly at the door (while being confronted by Deputy U.S. Attorney General Nicholas Katzenbach). Wallace is best known for the line:
In the name of the greatest people that have ever trod this earth, I draw the line in the dust and toss the gauntlet before the feet of tyranny, and I say segregation now, segregation tomorrow, segregation forever.
However, later in life, he changed his views. Here is another picture of the same event:
Segregation in education has produced other iconic images. There is for example the image of the “Little Rock Nine“. More on segregation here and here. Something on the related topic of Jim Crow is here. Other iconic images of human rights violations are here.