Dozens of temporary agency workers from Poland were on strike on Monday, protesting against low wages and unequal working conditions. The workers demonstrated against the Dutch supermarket chain Albert Heijn and the staffing company which hired them, Tempo Team.

One of the country’s largest trade union federations, FNV, said that 30 agency workers were involved in the demonstrations. The union said that the foreign workers were “poorly paid, hounded and harassed.”

It claimed that the supermarket chain employs half of its workers at distribution centres on temporary contracts, including “hundreds of Polish temporaries.” The union said the workers can easily lose their jobs and are constantly threatened with dismissals. They also pay high rents for their joint housing and now demand better working and living conditions.