Work to rule
Definition 1 of 1
Pro Tip 1/3Industrial Action
Work to rule is a protest tactic where employees perform their duties exactly as outlined, without extra effort. 
During the industrial dispute, the workers began to work to rule, causing delays.
Pro Tip 2/3Minimal Compliance
This phrase implies minimal engagement without breaking the contract, usually to signal discontent. 
To protest the new policy, the staff chose to work to rule.
Pro Tip 3/3Subtle Protest
Unlike strikes, work to rule is less disruptive and can be harder for employers to challenge legally. 
The union members voted against a strike but agreed to work to rule instead.