Scab

An inflatable rat commonly used during labour disputes in the United States to represent scabs.

A strikebreaker, pejoratively known as a scab, is a person who works despite an ongoing strike action, undercutting the impact of the strike on profit rates and therefore its chance of success. Scabs are usually unorganized proletarians who were not employed by the company before the trade union dispute but hired after or during the strike to keep the organization running, but the term may also refer to workers (union members or not) who continue to work.

Scabbing during a strike is typically known as "crossing the picket line".