Do you mean T2 Lockdown guilds?
There's Endless Time, they're part T2 LD and part T3 LD.
Mostly T2 LD as Lockdown Aces and Fallen Skyes merged to create it, and Lockdown Aces is T2.
But if you mean guilds that accept T2 players, then just look around the Guild Recruitment forum.
Make sure it's a good, active guild first though.