" ▁movement ▁as ▁the ▁CP ' s ▁leadership ▁in ▁it ▁became ▁apparent . ▁The ▁Party ▁founded ▁its ▁own ▁National ▁Min ers ▁Union ▁in ▁ 1 9 2 8 . ▁ ▁F oster ' s ▁return ▁to ▁power ▁ ▁C . ▁E . ▁Ruth enberg ▁died ▁on ▁March ▁ 2 , ▁ 1 9 2 7 , ▁and ▁his ▁long time ▁fa ction al ▁al ly ▁Jay ▁Lov estone ▁took ▁over ▁his ▁position ▁as ▁Executive ▁Secretary ▁of ▁the ▁party . ▁The ▁fa ction al ▁fighting ▁between ▁the ▁F oster ▁and ▁Lov estone ▁groups ▁continued , ▁but ▁now ▁became ▁over shadow ed ▁by ▁the ▁larger ▁struggle ▁in ▁the ▁Soviet ▁Union ▁between ▁Joseph ▁St alin ▁and ▁his ▁oppon ents . ▁ ▁A ▁firm ▁supp orter ▁of ▁Joseph ▁St alin , ▁F oster ▁split ▁with ▁James ▁P . ▁C annon ▁in ▁ 1 9 2 8 ▁and ▁supported ▁his ▁former ▁al ly ' s ▁exp ulsion ▁for ▁T rot sky ism . ▁F oster ▁was ▁made ▁General ▁Secretary ▁of ▁the ▁party ▁in ▁ 1 9 2 9 ▁with ▁the ▁support ▁of ▁the ▁Com intern , ▁depos ing ▁Jay ▁Lov estone , ▁who ▁was ▁sympath etic ▁to ▁B uk har in ▁and ▁whose ▁policies ▁of ▁American ▁exception al ism ▁were ▁an ath ema ▁to ▁St alin ' s ▁new ▁Third ▁Period ▁line . ▁ ▁That ▁Third ▁Period ▁line ▁also ▁called ▁for ▁creation ▁of ▁new , ▁revolution ary ▁un ions ▁outside ▁the ▁A FL . ▁While ▁F oster ▁had ▁always ▁den ounced ▁dual ▁union ism , ▁he ▁dut iful