▁it ▁was ▁a ▁Cold ▁War - era ▁commun ist ▁front . ▁The ▁group ▁was ▁composed ▁by ▁a ▁majority ▁of ▁scient ists ▁who ▁supported ▁commun ism . ▁The ▁feder ation ▁opposed ▁nuclear ▁tests ▁conducted ▁by ▁the ▁United ▁States ▁and ▁by ▁the ▁other ▁states . ▁ ▁History ▁▁ ▁The ▁W FS W ▁was ▁founded ▁at ▁a ▁conference ▁in ▁London ▁held ▁on ▁ 2 0 – 2 1 ▁July ▁ 1 9 4 6 ▁at ▁the ▁initi ative ▁of ▁the ▁British ▁Association ▁of ▁Scient ific ▁Work ers . ▁The ▁original ▁conference ▁was ▁attended ▁by ▁ 1 8 ▁organis ations , ▁representing ▁ 1 4 ▁countries . ▁ ▁The ▁W FS W ▁was ▁accused ▁of ▁to eing ▁the ▁Soviet ▁line ▁during ▁the ▁Cold ▁War . ▁At ▁the ▁time ▁of ▁the ▁T ito - St alin ▁split ▁the ▁Y ug oslav ▁affili ate ▁was ▁exp elled ▁from ▁the ▁Federation . ▁During ▁the ▁Korean ▁War ▁it ▁supported ▁the ▁Commun ist ▁Chinese ▁forces . ▁The ▁Federation ▁protest ed ▁against ▁restrictions ▁on ▁the ▁free ▁exchange ▁of ▁scientific ▁information ▁or ▁the ▁movement ▁of ▁scient ists ▁by ▁the ▁with hold ing ▁of ▁vis as ▁or ▁pass ports ▁by ▁Western ▁countries , ▁but ▁never ▁by ▁Commun ist ▁ones . ▁Like wise , ▁the ▁W FS W ▁spoke ▁out ▁against ▁American , ▁British ▁and ▁French ▁nuclear ▁testing , ▁but ▁not ▁against ▁Soviet ▁nuclear ▁testing . ▁During ▁the ▁Cub an ▁miss ile ▁crisis ▁the ▁World ▁Federation ▁of ▁Scient ific ▁Work ers ▁mobil ised ▁its ▁members ▁to ▁send ▁tele gram s ▁to ▁John ▁F . ▁Kennedy ▁and