Historically, the most potent union tactic when collective bargaining efforts break down has been the: strike. lockout. primary boycott. court injunction.

Strike

Explanation:

Historically, the strike has been the most potent union tactic when collective bargaining efforts break down. Strikes are organized protests in which workers stop working. Most of the time, these are organized by unions, and they are intended to achieve a particular benefit for the workers, such as better hours or pay. These were developed during the Industrial Revolution and were able to achieve great results.

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