▁Guard ▁was ▁must ered ▁into ▁federal ▁service . ▁The ▁organization ▁was ▁to ▁serve ▁as ▁a ▁home ▁guard ▁during ▁World ▁War ▁I . ▁On ▁April ▁ 1 8 , ▁ 1 9 1 7 , ▁Governor ▁Samuel ▁W . ▁Mc Call ▁appointed ▁Parker ▁to ▁the ▁State ▁Guard ▁Board , ▁which ▁was ▁task ed ▁with ▁organ izing ▁the ▁new ▁Guard . ▁Once ▁the ▁guard ▁was ▁formed , ▁Parker ▁was ▁placed ▁in ▁command ▁of ▁the ▁Guard ' s ▁ 4 th ▁brig ade . ▁ ▁During ▁the ▁ 1 9 1 9 ▁Boston ▁Police ▁St rike , ▁Parker ▁was ▁placed ▁in ▁command ▁of ▁the ▁six ▁State ▁Guard ▁reg iments ▁called ▁out ▁to ▁police ▁the ▁city . ▁Parker ▁order ▁the ▁caval ry ▁to ▁establish ▁dead ▁lines ▁in ▁areas ▁where ▁crow ds ▁were ▁collect ing ▁and ▁to ▁keep ▁people ▁moving ▁while ▁using ▁as ▁little ▁violence ▁as ▁possible . ▁The ▁guard ▁went ▁on ▁duty ▁on ▁September ▁ 1 0 , ▁ 1 9 1 9 ▁with ▁ 5 , 0 0 0 ▁soldiers ▁pat rolling ▁the ▁streets . ▁That ▁night ▁two ▁men ▁were ▁killed ▁when ▁gu ards men ▁opened ▁fire ▁on ▁an ▁un r uly ▁crowd ▁in ▁South ▁Boston . ▁Another ▁was ▁killed ▁during ▁a ▁ri ot ▁in ▁S col lay ▁Square . ▁Another ▁man ▁was ▁shot ▁and ▁killed ▁by ▁the ▁gu ards men ▁the ▁following ▁day ▁during ▁the ▁arrest ▁of ▁ 4 4 ▁men ▁who ▁were ▁shooting ▁cra ps . ▁The ▁guard ▁was ▁rel ieved ▁from ▁duty ▁on ▁December ▁ 2 1 , ▁ 1 9 1 9