▁of ▁Bl ay ney ▁F . ▁Mat he ws , ▁head ▁of ▁Warner ▁Brothers ' ▁security , ▁who ▁had ▁him ▁arrested . ▁He ▁was ▁never ▁charged ▁and ▁was ▁released ▁several ▁days ▁later . ▁This ▁not or iety ▁led ▁to ▁his ▁subsequent ▁position ▁as ▁the ▁business ▁representative ▁for ▁the ▁painter ' s ▁union ▁and ▁as ▁a ▁result ▁he ▁became ▁one ▁of ▁the ▁major ▁negoti ators ▁who ▁settled ▁the ▁strike ▁in ▁June . ▁ ▁In ▁May ▁ 1 9 4 1 ▁Sor rell ▁called ▁for ▁a ▁strike ▁against ▁the ▁Disney ▁film ▁studio . ▁The ▁strike ▁was ▁supported ▁by ▁the ▁newly ▁formed ▁Screen ▁Cart oon ist ' s ▁Gu ild , ▁and ▁the ▁co operation ▁resulted ▁in ▁the ▁organization ▁of ▁the ▁Conference ▁of ▁Studio ▁Un ions ▁( CS U ), ▁which ▁Sor rell ▁proceeded ▁to ▁lead . ▁ ▁In ▁ 1 9 4 5 , ▁Sor rell ▁lead ▁the ▁C SU ▁strike ▁that ▁led ▁to ▁Hollywood ▁Black ▁Friday . ▁The ▁strike ▁origin ated ▁from ▁a ▁dispute ▁between ▁two ▁un ions , ▁C SU ▁and ▁I AT SE , ▁over ▁which ▁one ▁of ▁them ▁had ▁union ▁authority ▁over ▁sevent y - se ven ▁set ▁decor ators . ▁After ▁an ▁N LR B ▁vote ▁and ▁War ▁Labor ▁Board ▁decision ▁in ▁favor ▁of ▁C SU , ▁the ▁stud ios ▁refused ▁to ▁recognize ▁C SU ' s ▁b arg aining ▁authority , ▁and ▁the ▁strike ▁began . ▁After ▁the ▁violence ▁on ▁Black ▁Friday , ▁the ▁strike ▁quickly ▁settled . ▁However ▁coll usion ▁between ▁the ▁I AT SE ▁leadership ▁and ▁the