Nearly one in 10 (9%) of workers have faced “fire and rehire” tactics since the first lockdown in March, according to TUC.
The body claimed that the controversial practice is becoming increasingly prominent across a range of industries.
Moreover, the group has also highlighted the stark contrast between BME workers (15%) and white workers (8%) who have been told to reapply for their jobs on worse terms and conditions.
Frances O’Grady, general secretary at TUC, called on the tactics to be “outlawed” as they have “no place in modern Britain”.
He said: “Everyone deserves to be treated with dignity and respect at work. Forcing people to re-apply for their jobs on worse terms and conditions is plain wrong.
“Boris Johnson promised to make the UK the best place in the world to work in. It’s high time he delivered on this promise. That means fast-tracking his much-delayed employment bill. And it means abandoning any attempt to water down hard-won workers’ rights from the EU.”
The news comes after Unite announced it will take action on 5 February against Heathrow Airport’s policies that it says come out of “greed and not need”.
A similar situation is also occurring at British Gas, who faces allegations from members of the GMB union that argue the company ordered its staff to accept inferior contracts.