work-to-rule

noun
  1. a form of industrial action in which employees adhere strictly to all the working rules laid down by their employers, with the deliberate intention of reducing the rate of working
verb work to rule
  1. (intr) to decrease the rate of working by this means
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012