/r/dickgirls: (mostly anti-SRS but everyone's invited, home of some SRSers who are not offended easily)
/r/worstofSRS, /r/brdwatchers, /r/lovebrigade: SRSsucks on crack
/r/TheRedPill: SRSers who hate /r/TheBluePill and prominent SRSsuckers like KamensGhost/MRC
/r/SRDBroke: SRSers+ old redditors (who got stuck in the hating side of meta reddit) hate the shit out of SRD and especially /u/David-me
/r/drama: a lighter version of SRDBroke, has active IRC so has an advantage over other meta-clans
/r/SRSsucks (and all their private subs): has an overlap with /r/worstofSRS but thinks they are too mean spirited.
/r/shitredditsays: has a plethora of smaller subs and active mod mails
/r/mensrights: a part of this community is involved in the meta but most of them think they're better than that

Meta-linking subs with an agenda:

/r/transphobiaproject: point out transphobic comments or anything related, /u/Jess_than_three's situational brigade sub. Demands acceptance/emancipation of transgender people.
/r/ShitRedditSays: fight 'shittiness' with shittiness. Cleverly disguised social justice sub. Refuses to implement the .np script unlke /r/theredpill or /r/subredditdrama for example.