picket

n. 尖木桩(前哨)
vt 用桩围住(设置警戒哨)

Some of the union members did not want to picket.

工会的一些会员不想担任罢工纠察员.

Five pickets were injured in the scuffle.

在混战中有五名罢工纠察队员受伤.