Scores of workers staged protests at five sites across England today in support of colleagues at a Swindon hospital who say they're being harassed, bullied and discriminated against.
Cleaners, porters and domestic staff at Great Western Hospital are in dispute with PFI employer Carillion over the allegations and say the firm has been "dragging its feet" over a probe into the abuse of staff.
The 150 GMB members have already taken part in strikes over 18 days in February and March.
And union supporters held demos today outside Carillion sites in Bristol, Wolverhampton, Gateshead and two in Yorkshire.
GMB said the firm was set to unveil the conclusions of a second investigation into the allegations, which go back five months, on April 27. But it didn't.
The GMB members had suspended strike action to allow Carillion time to conduct the inquiry.
GMB national officer Justin Bowden said: "This shows the culture of abusing its own staff is ingrained.
"It is going to require a public campaign to force Carillion to confront institutional abuse of its own employees. These protests are just the start of that campaign."
GMB said that 90 workers gave evidence earlier this year of "terrible bullying."
Union organisers reported good turnouts at each of the sites and although there is talk of more action no further details are available yet.