Ian Hodson, president of the Bakers Union, said the stories exposed in the BBC investigation were “horrific” and had “helped to shine a light on workplace harassment”.
“The most important thing to me is the workers,” he told BBC News. “Their voices need to be heard. Everyone deserves the right to be safe when they go to work.”
Luise Schroter, senior policy officer at the Corporate Justice Coalition, said harassment at McDonald’s “must end”.
“Workers and their unions are key to ending these systemic abuses and must not be sidelined,” she said.
After the initial BBC investigation, McDonald’s apologised and set up a new unit to deal with complaints.
But since then, more than 160 people have approached the BBC with allegations, while the EHRC has heard 300 reported incidents of harassment.
Last January, McDonald’s workers told us they still faced sexual harassment more than a year after its chief executive promised to clean up behaviour at the fast-food chain.
More than 700 current and former junior employees are now taking legal action against the firm.
Kiran Daurka, employment partner at law firm Leigh Day, which is representing the workers, says their clients accuse McDonald’s of failing to protect them.
In November, the equality watchdog said McDonald’s would bring in new sexual harassment training for managers in strengthened measures agreed with it to protect its staff from abuse.
At the time, McDonald’s said it welcomed the new measures, adding that they would “build on the significant progress we have already made in this space”.
Responding to the latest developments, a McDonald’s spokesperson said: “We are aware of the NCP’s initial assessment and continue to engage constructively with the OECD process.
“We are reviewing the information and considering next steps.”
