A scab is a union term generally applied to a worker who refuses to join coworkers in a strike. Sometimes applied to members of a non-striking union who pass through a striking union's picket line or someone who refuses to join a union. Scab may refer to someone who works (or provides workers) during a strike.
Workers argue against scabs because the belief that workers have to honor picket lines and it's seen as a class struggle. They aim to come together against our common enemy, the boss. The following is grievance information for a postal worker, referred to as a scab by opting not to join a union:
"If, the scab does not come to an agreement with the U.S. Postal Service, and the issue is not settled within 5 days from the date the grievance was filed with the U.S. Postal Service supervisor or the supervisor renders a decision before 5 days, which ever comes first, then the scab should forward a certified letter to the KYOWVA Area Local, APWU, AFL-CIO, 1010 10th Street Huntington, W.Va. 25707 with all pertinent information relevant to the issue/grievance, and request Union assistance, in the case. This action should be taken promptly because, the Union only has 10 days after the scab concludes the above mentioned step 1 process on the issue / grievance,to process the grievance and file it at step 2 of the grievance procedure.If,grievances are not filed timely, then the grievance may be won by the U.S. Postal Service simply by arguing it,as being untimely."