The information was leaked by a disaffected insider of the "Sunrise Movement," part of a loose but extremely coordinated network of left-leaning activists mobilizing across the U.S. in an effort to ferment chaos in the wake of a potential Trump victory or a contested election.
The videos and documents discuss a well-coordinated plan to shut down federal buildings (including the White House), public transportation portals, and disrupt Congress when it returns post-election. Sunrise is an umbrella movement comprised of 400 "hubs" and hundreds of affinity groups including 350.org and Extinction Rebellion.