: : And if he insisted on threat of firing the next option might be to join or form a union for collective bargaining, right?: but at no point can a union coercively stop people who do want to work from doing so, ie outside / new employees.
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Quite so, and this would be an effective tactic by a business to destroy a union. Therefore it would make sense for a union to insist upon a contract that does not permit scabs to replace the strikers, right?