The practice or ideology of being a blackleg, which is someone who works during a strike or refuses to support worker solidarity.
From blackleg (a worker who breaks strike lines) + -ism (a system or practice). The term blackleg itself comes from 17th-century usage referring to cattle disease, later applied metaphorically to scab workers in 19th-century British labor disputes.
During the Industrial Revolution, strikebreakers were so despised that workers called them 'blacklegs' — possibly because early ones had actually suffered from blackleg disease in cattle, marking them as untrustworthy or diseased in reputation. The word became shorthand for betrayal itself.
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