Chuck Randall was on the verge of unveiling an ambitious real estate deal he hoped would give his small Native American tribe a bigger cut of a potentially lucrative casino project. A well-timed leak derailed it all. In July of 2012, printed excerpts from Randall’s private emails were hand-distributed across the Shinnecock Nation’s square-mile reservation, a wooded peninsula hanging off the South Fork of Long Island. The five-page pamphlets detailed secret negotiations between Randall, his triba...