BANSHEE CHAPTER **** U.S.A. 2013 Dir: Blair Erickson 85 mins Alternating between standard third-person vantage point, faux documentary and found-footage horror, Blair Erickson’s story of young documentarians uncovering a sinister, extensive government conspiracy, captures a vivid sense of mounting dread. Its basis is the U.S. government’s “MK=Ultra” project, a series…