The Russian Photography Collection: 1917-1945. Wonderful images by Aleksandr Rodchenko, Max Alpert, Dmitri Debabov, Mikhail Grachev, Yevgeni Khaldei, Georgi Zelma, Moisei Nappelbaum , Boris Ignatovich and other photographers.

The collection was assembled as the Soviet Union tore itself apart leaving a tattered social fabric behind. Organized as a history of 20th century photography of the Soviet Union the collection focuses on the categories: Constructivism/Avant-Garde, Propaganda, Photo-Reportage, War Photography, and Socialist Realism which provide the most effective and complete view of one of the most incredible experiments in human history.

BTW, my favourite session there is this. (via Boing Boing)