secondary picketing
noun/ˌsekəndri ˈpɪkɪtɪŋ/
/ˌsekənderi ˈpɪkɪtɪŋ/
[uncountable] (British English)- the act of preventing workers who are not involved in a strike from supplying goods to the company where the strike is held
二级纠察封锁（阻止未参加罢工的工人向公司供应货物）