Workers at a food manufacturing firm in Lincolnshire are to strike for more than a month in a pay dispute.
More than 700 production line staff at Bakkavor in Spalding are set to walk out from 25 November, with the action planned to last until 2 January.
The Unite union said many workers "earn 1p over the national minimum wage" and were having to use food banks.
Unite said the striking workers, who make soups, sauces and deli produce, rejected a 6.5% pay offer, calling it a "substantial pay cut" when taking the inflation rate into account.
Sharon Graham, the union's general secretary, said: "The situation these workers face is exactly what is wrong with Britain's economy today.
Unite called on the major supermarkets which used Bakkavor to make own-brand products to pressure the firm to give workers a "proper pay rise".
A company spokesperson said: "Across its UK sites, Bakkavor has been awarding pay increases for colleagues - a move to support its people despite the challenging economic context for the sector.
"Bakkavor believes its proposed 6.5% pay award for colleagues in Spalding is positive and sustainable and is part of a broader package of employee benefits."
The food producer recently announced it was set to close one of its manufacturing sites in nearby Sutton Bridge, with hundreds of jobs at risk.