<a href="http://www.cnbc.com/2016/06/06/palantir-2016-disruptor-50.html" target="_self">Palantir Technologies</a>, the Silicon Valley data company co-founded by billionaire investor Peter Thiel, has developed an almost mythical reputation for its work building tools for the U.S. intelligence community. But Palantir has had a far rockier relationship with the nation's top spy agencies than its image would let on, BuzzFeed News has learned.