excommunicate, curse - exclude from a church or a religious community; "The gay priest was excommunicated when he married his partner"

lock out - prevent employees from working during a strike

prevent, keep - prevent from doing something or being in a certain state; "We must prevent the cancer from spreading"; "His snoring kept me from falling asleep"; "Keep the child from eating the marbles"

ostracise, ostracize - avoid speaking to or dealing with; "Ever since I spoke up, my colleagues ostracize me"