The STM has sent out letters to the 200 bus drivers who went on a wildcat strike last week.
They decided not to take their buses out of the Anjou garage last Monday, the day of the season's first snowfall, in a protest against the paperwork they've got to do.
An STM spokesperson tells CJAD 800 News that the drivers will be getting letters with sanctions ranging from warnings to suspensions.
Last week the STM suspended the driver it says incited the walkout.