Knobstick

[Tina]

One who refuses to join, or withdraws from, a trades
union.

[Couch Potatoe]

A person who works despite a strike is going on. Synonym: [Strikebreaker], Black-Leg.
Knobsticks are employed worldwide since the 19th century, wherever workers go on strike or engage in related actions. United Kingdom laws [permit] strikebreaking, and courts have significantly restricted the right of [unions] to punish members who act as Knobsticks. In the U.S, employers enjoy the unrestricted right to permanently replace strikers with strikebreakers.

[Julian]

A derogitory term for use in most [situations], combination of the [terms] [knob] and stick