ance ▁against ▁school ▁priv at ization . ▁CO RE ▁accused ▁the ▁inc umb ent ▁United ▁Progress ive ▁C au cus ▁( UP C ) ▁of ▁capit ulating ▁to ▁corpor ate ▁interests , ▁sil encing ▁diss ent ▁within ▁the ▁union , ▁and ▁collabor ating ▁with ▁the ▁city ▁to ▁prevent ▁union ▁out re ach ▁at ▁schools . ▁CO RE ▁quickly ▁took ▁action ▁to ▁distinguish ▁itself ▁from ▁U PC , ▁the ▁previous ▁c au cus ▁cont rolling ▁the ▁CT U , ▁re aff irm ▁its ▁grass ro ots ▁support , ▁and ▁launch ▁a ▁campaign ▁to ▁defend ▁public ▁education . ▁The ▁new ▁leadership ▁cut ▁pay ▁for ▁union ▁officers ▁and ▁used ▁the ▁sav ings ▁to ▁expand ▁out re ach . ▁CO RE ▁represented ▁a ▁major ▁b loc ▁of ▁diss ent ▁at ▁the ▁ 2 0 1 2 ▁A FT ▁convention , ▁and ▁held ▁signs ▁in ▁protest ▁of ▁Race ▁to ▁the ▁Top ▁during ▁a ▁speech ▁from ▁Vice ▁President ▁Joe ▁B iden . ▁▁ 2 0 1 2 ▁St rike ▁In ▁early ▁September ▁ 2 0 1 2 ▁she ▁led ▁the ▁Chicago ▁Te ach ers ▁Union ▁on ▁a ▁ 1 0 - day ▁strike . ▁Emer ging ▁vict orious , ▁the ▁union ▁soft ened ▁the ▁proposed ▁teacher ▁evaluation ▁system , ▁prevent ed ▁the ▁inst itut ing ▁of ▁mer it ▁pay , ▁and ▁ens ured ▁prote ctions ▁for ▁veter an ▁teachers ▁in ▁ph ased ▁out ▁schools . ▁Prior ▁to ▁the ▁strike ▁she ▁went ▁through ▁several ▁months ▁of ▁negoti ations ▁with ▁Chicago ▁mayor ▁Rah m ▁E manuel ▁and ▁E manuel ▁app o