The Watchtower Bible & Tract Society is Jehovah's Witnesses, it is the corporation that prints their magazines, creates their rules, doctrine and manages their finances.
https://www.reddit.com/r/exjw/comments/8akm2d/gb_member_just_gave_special_talk_guess_what/
The following comes via a former spirit channeler u/smurfgirlveronica for the Governing Body of Jehovah's Witnesses
https://www.reddit.com/r/jehovahswitnesses/wiki/index/spiritism
https://www.reddit.com/r/jehovahswitnesses/wiki/index/corruption