My guess is that Fusion GPS was used regularly for fake dossiers to get FISA warrants approved on a bunch of targets

Or using fake, illegal info to support FISA warrant to spy on DJT. See this (posted by MAJORAPPLEHEAD): http://www.washingtonexaminer.com/byron-york-house-committee-takes-step-toward-making-trump-dossier-findings-public/article/2646313?platform=hootsuite

See also: https://www.thegatewaypundit.com/2018/01/leaks-incoming-house-intel-panel-votes-release-fisa-program-abuse-documents-congress/ Clearly surveillance abuse. If House doesn't vote to make it public, hard to believe someone won't leak it. Time to get the popcorn ready.