What is the name of the movie about a cult in the desert.

Everyone is wearing blue and marching in a line to get on to this "bus" I cant remember details but first saw it on IFC channel around 2009-2010.... They were in a desert and everyone was sort of brainwashed and wearing this blue outfit..... That's about all I can remember! Its bugging me to death and i'm dying to see it again!!
Asked Oct 10, 2014

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