Большой русско-английский фразеологический словарь
Ш25
ОДНА ШАЙКА (ШАЙКА-ЛЁЙКА, ЛАВОЧКА)highly coll,usu.disapprovNPthese forms onlysubj-complwith бытья (subj:human, pi)) (the people in question) are similar to each other, have the same characteristics-usu.the same faults: все они (вы) одна шайка-лейка = they're (you're) all birds of a featherthey're (you're) all of the same Ilk (stripe, sortetc)they're (you're) all one gang(in refer, to scheming, plottingetc) they're (you're) in cahoots.