The welders' union at Ajax is on strike. The maintenance union has decided to walk out in support of the welders' union. This is known as

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This is a sympathy strike, where another union walks out in support of another union's strike. A closed shop requires all employees to be union members, a union shop requires employees to become union members after being hired, and a secondary boycott would involve boycotting a company that does business with the company being struck (which is not the case in this scenario).

The Welders' Union at Ajax Is on Strike