the.com/picket line

A sidewalk that turns coworkers into a wall employers can't walk through.

means A line of striking workers stationed outside a workplace to protest, publicize their cause, and discourage others from entering.

from From 'picket,' a pointed wooden stake driven into the ground — first used for military outposts where soldiers stood sentry duty, watching for the enemy. Labor borrowed the word in the 1800s: strikers became human stakes planted outside a workplace, standing guard not against invaders but against replacement workers and business as usual.

origin
military term for a guard outpost
legal shield
peaceful picketing is protected US labor law
crossing it
the ultimate workplace betrayal, literally and symbolically
leverage
costs employers money and public image, not just morale
the.com · every word