▁at ▁the ▁est ates ▁was ▁likely ▁limited ▁to ▁prepar ing ▁the ▁labour ers ▁for ▁sc orch ed ▁earth ▁tact ics ▁in ▁case ▁of ▁a ▁Dutch ▁advance . ▁▁ ▁The ▁Sar b up ri ▁chairman ▁Mar uto ▁Dar us man ▁was ▁killed ▁in ▁the ▁midst ▁of ▁the ▁ 1 9 4 8 ▁Mad i un ▁revol t . ▁ ▁St rik es ▁of ▁ 1 9 5 0 ▁& ▁ 1 9 5 3 ▁In ▁the ▁early ▁ 1 9 5 0 s ▁Sar b up ri ▁was ▁the ▁sole ▁estate ▁workers ▁trade ▁union ▁of ▁national ▁importance ▁in ▁the ▁country . ▁A ▁massive ▁strike ▁was ▁organized ▁by ▁Sar b up ri ▁August – Se ptember ▁ 1 9 5 0 , ▁bringing ▁the ▁vast ▁majority ▁of ▁private ▁est ates ▁to ▁a ▁halt . ▁As ▁a ▁result ▁of ▁the ▁strike , ▁the ▁government ▁interven ed ▁and ▁instit uted ▁a ▁minimum ▁w age ▁for ▁estate ▁labour ▁( sign ific antly ▁higher ▁than ▁previous ▁average ▁w ages ). ▁The ▁strike ▁constit uted ▁the ▁first ▁major ▁victory ▁of ▁SO B SI . ▁A ▁second ▁major ▁strike ▁was ▁organized ▁in ▁September ▁ 1 9 5 3 , ▁forcing ▁the ▁government ▁to ▁implement ▁a ▁ 3 0 % ▁w age ▁increase ▁for ▁estate ▁workers . ▁▁ ▁Sar b up ri ▁campaign ed ▁act ively ▁against ▁the ▁use ▁of ▁temporary ▁labour ▁at ▁est ates . ▁At ▁times ▁the ▁union ▁called ▁for ▁increased ▁government ▁control ▁to ▁prevent ▁the ▁use ▁of ▁temporary ▁labour , ▁at ▁times ▁Sar b up ri ▁called ▁for ▁total