“The workers have called on the WMF, as the effective management of the global non-profit operation, to uphold recent public commitments made by its leadership affirming the rights of staff to organise and form a union.”
“Outside of the United States, the United Kingdom is WMF’s largest employment location, and a substantial majority of its UK staff are union members.”
If the majority of a UK workforce are in a union, there is a legal requirement to recognise that union and work with them.
2
UK Wikipedia Workers seek union recognition | Spyke
“The workers have called on the WMF, as the effective management of the global non-profit operation, to uphold recent public commitments made by its leadership affirming the rights of staff to organise and form a union.”
“Outside of the United States, the United Kingdom is WMF’s largest employment location, and a substantial majority of its UK staff are union members.”
If the majority of a UK workforce are in a union, there is a legal requirement to recognise that union and work with them.