▁Action . ▁The ▁r ally ▁drew ▁thousands ▁of ▁demonstr ators ▁across ▁fifty - five ▁Canadian ▁cities . ▁N DP ▁leader ▁Thomas ▁Mul ca ir ▁joined ▁demonstr ators ▁in ▁Montreal ▁in ▁a ▁march ▁to ▁Justin ▁Tru de au ' s ▁office , ▁while ▁Green ▁Party ▁leader ▁Elizabeth ▁May ▁joined ▁the ▁r ally ▁in ▁Toronto . ▁ ▁Following ▁the ▁success ▁of ▁Le ad ▁Now ' s ▁national ▁public ▁protest ▁a ▁subsequent ▁grass ro ots ▁effort ▁led ▁in ▁part ▁by ▁Bow inn ▁Ma ▁led ▁to ▁a ▁second ▁cross - Can ada ▁r ally ▁effort ▁in ▁opposition ▁of ▁Bill ▁C - 5 1 ▁on ▁April ▁ 1 8 , ▁ 2 0 1 5 . ▁This ▁grass ro ots ▁effort ▁also ▁mobil ized ▁members ▁of ▁the ▁public ▁against ▁ ▁Bill ▁C - 5 1 ▁by ▁raising ▁aw aren ess ▁through ▁pet ition ▁drives ▁and ▁by ▁launch ing ▁a ▁letter - writing ▁campaign ▁that ▁spread ▁across ▁Canada . ▁ ▁The ▁main ▁website ▁for ▁the ▁coal ition ▁of ▁groups ▁working ▁to ▁stop ▁C - 5 1 ▁can ▁be ▁found ▁at ▁Stop C 5 1 . ca . ▁The ▁# Stop C 5 1 ▁campaign ▁has ▁seen ▁over ▁ 2 7 5 , 0 0 0 ▁online ▁actions ▁as ▁of ▁June ▁ 2 0 , ▁ 2 0 1 5 ▁in ▁addition ▁to ▁in - person ▁events ▁across ▁the ▁country . ▁ ▁On ▁June ▁ 1 7 , ▁ 2 0 1 5 , ▁the ▁ha cker ▁group ▁An onymous ▁claimed ▁responsibility ▁for ▁a ▁den ial ▁of ▁service ▁attack ▁against