Study group
Study Group is a term used when a group of people form a cult like club. In this club, they have different roles; kidnapper, murderer, actress/actor, hacker, runner, tech guy/girl, stalker,etc. They plot the deaths of people who have hurt them in the past. The Study Group normally doesn't act on their plans, but it depends on the situation. They use the term Study Group as a cover story when they meet for their weekly sessions.
Ex Boyfriend: Hey dumb ass! You're such a slut! I bet you're going to that party tonight to get yourself knocked up!

Olivia: Actually I'm going to a Study Group....