The term 'Strike Defier' is used to describe someone who refuses to join a strike or labor action. The crossword solution for this term is SCAB, which is an acronym for 'Strikebreaker, Crosser, Agitator, and Blackleg'. A SCAB is someone who works during a strike, often taking the place of striking workers, and is seen as a traitor by the strikers. Scabs are often viewed as a threat to the solidarity of the union and are not welcomed by the strikers.