The Ditch (2010)

The Ditch, also known as Goodbye Jiabiangou is a 2010 film produced and directed by Wang Bing, an independent Chinese filmmaker better known for his work on documentaries. The film, on the subject of Chinese forced-labour camps during early 1960 Maoist China era, was chosen to be the film sorpresa in the 2010 Venice Film Festival.

More at Wikipedia.