▁the ▁B ols he vik ▁leaders ▁and ▁diss ip ated ▁within ▁a ▁few ▁days . ▁In ▁the ▁after math , ▁Len in ▁fled ▁to ▁Finland ▁under ▁threat ▁of ▁arrest ▁while ▁T rot sky , ▁among ▁other ▁prominent ▁B ols he vik s , ▁was ▁arrested . ▁The ▁July ▁Days ▁confirmed ▁the ▁popular ity ▁of ▁the ▁anti - war , ▁radical ▁B ols he vik s , ▁but ▁their ▁un prep ared ness ▁at ▁the ▁moment ▁of ▁revol t ▁was ▁an ▁embar rass ing ▁g aff e ▁that ▁lost ▁them ▁support ▁among ▁their ▁main ▁constitu ent ▁groups : ▁soldiers ▁and ▁workers . ▁ ▁The ▁B ols he vik ▁failure ▁in ▁the ▁July ▁Days ▁proved ▁temporary . ▁The ▁B ols he vik s ▁had ▁under g one ▁a ▁spect ac ular ▁growth ▁in ▁membership . ▁Where as , ▁in ▁February ▁ 1 9 1 7 , ▁the ▁B ols he vik s ▁were ▁limited ▁to ▁only ▁ 2 4 , 0 0 0 ▁members , ▁by ▁September ▁ 1 9 1 7 ▁there ▁were ▁ 2 0 0 , 0 0 0 ▁members ▁of ▁the ▁B ols he vik ▁fa ction . ▁ ▁Pre viously , ▁the ▁B ols he vik s ▁had ▁been ▁in ▁the ▁minor ity ▁in ▁the ▁two ▁leading ▁cities ▁of ▁Russia — St . ▁Petersburg ▁and ▁Moscow ▁behind ▁the ▁Mens he vik s ▁and ▁the ▁Social ist ▁Revolution aries , ▁by ▁September ▁the ▁B ols he vik s ▁were ▁in ▁the ▁majority ▁in ▁both ▁cities . ▁ ▁Furthermore , ▁the ▁B