I did a thread search and saw a few threads that looked like they were pking clans or groups. (There were in the first 10 pages ish of this subforum.)
Also, there is a PK clan/group that frequently appears on page 1 or 2 of this forum.
I'm avoiding providing names because I don't know all of the possible clans/groups that pk and have a thread in this subforum. As such, I don't want to 'favor' any one clan/group over another.
So, I think that if you browse this section/subforum, you are likely to find answers to your question - if it turns out that no one notices your thread here.
Good luck as you continue to explore the forums and the game!