Labor
-The term for a person who breaks a strike by returning to the workplace when his or her co-workers are still engaged in demonstrations is strikebreaker, or the more derogatory term:

Question

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The term scab is used to describe a strikebreaker who returns to work or continues working while the rest of his fellow employees are still on strike. Over time, employers began hiring people to act as strikebreakers after strikes had already begun. Though the new worker had not been on the payroll when the strike began, it was considered bad form to take the place of a striking worker.

Labor -The Term for a Person Who Breaks a Strike by by Returning