When collective bargaining negotiations broke down between the Soft Rock Miners' Union and Consolidated Moose Pastures Mining Company, the union called a lawful strike of its members. Picket lines were set up at the entrance to the mine. The union may also set up lawful picket lines during a lawful strike at the premises of all customers and suppliers of the employer for the purpose of shutting down their businesses, and to require them to buy from competitors of their employer.

Question

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While unions can picket at their employer's premises during a lawful strike, extending picket lines to the premises of customers and suppliers with the intent of shutting down their businesses or forcing them to buy from competitors generally exceeds lawful picketing practices and can be considered secondary boycotting, which is illegal under many labor laws.

When Collective Bargaining Negotiations Broke Down Between the Soft Rock