work to rule
n.— «Teachers are now following the existing contract to the letter, a practice called “work to rule.” Teachers begin and end the work day specified in the contract and no earlier or later.» —“Westborough teacher contract talks heat up” by John Fenuccio MetroWest Daily News (Framingham, Massachusetts) Apr. 23, 2008. (source: Double-Tongued Dictionary)
Further reading
Old. Elderly. Senior. Why are we so uncomfortable when we talk about reaching a certain point in life? An 82-year-old seeks a more positive term to describe how she feels about her age. And: a linguist helps solve a famous kidnapping case, using the...
This has been used, in England at least, for decades — at least since the 1950s when I first heard it, and I suspect much earlier. The derivation is from the union rule book.
I haven’t looked up any references yet, but I am sure they will be easy to find.