The GMB union is organising protests outside five Amazon warehouses today, to highlight what they call "inhuman" working conditions at the retail giant.
It comes on one of the year's busiest periods for Amazon, with Black Friday shopping reaching a peak for many companies today.
Protests will be held outside the company's warehouses in Rugeley, Peterborough, Milton Keynes, Warrington, and Swansea.
"We're standing up and saying enough is enough. You'd think making the workplace safer so people aren't carted out of the warehouse in an ambulance is in everyone's interest, but Amazon seemingly have no will to get round the table with us.
"Amazon has created in the UK more than 25,000 good jobs with a minimum of £9.50 an hour and in the London area, £10.50 an hour on top of industry-leading benefits and skills training opportunities.