After yet another speed-up in a workplace notorious for its lightning pace of work, workers at a Minnesota Amazon warehouse walked off the night shift for three hours.

The March 7 walkout at Amazon’s fulfillment center in Shakopee, Minnesota, was these workers’ second job action in three months.

The strikers work in the stow department, shelving items after they have been unloaded from inbound trucks and processed. Once shelved, the merchandise is then compiled into customer orders by pickers.