A lot of the pictures in the Dogville credits in the last post were taken by this dude: Jacob Holdt.
A Danish photographer who traveled America, Holdt sold his blood plasma to buy film in order to record all American walks of life. The depictions of poverty were so powerful, the Soviet Union wanted to use the pics to undermine Jimmy Carter's human rights posturing.
Click the picture below for a 170 page gallery of Holdt's work.
A lot of 'em are great. A lot of 'em are NSFW, too.