"Work to rule" can be used by the union as a way to strengthen their bargaining position and, technically, not be on strike.

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"Work to rule" is a labor tactic in which employees (usually union members) do not go on strike, but instead adhere strictly to the terms of their employment contract in order to slow down productivity and place pressure on management to meet their demands. This can be seen as a way to enhance the union's bargaining power without risking a full-scale work stoppage.

"Work to Rule" Can Be Used by the Union as a Way