Montreal's white collar workers are launching five weeks of rotating strikes at 10 a.m. Monday.

Every weekday until March 1, and on many weekends as well, a new group of workers will walk off the job.

During this period white collar workers will also refuse to perform overtime, although they will perform all essential services as required by law.

The white collar workers, all members of the Quebec Federation of Labour, have not had a contract with the city for four years -- since Gerald Tremblay was mayor.

The union says one of its main complaints is that the city of Montreal relies too much on outside contractors.

The first employees to go on strike include employees in the boroughs of Ahuntsic-Cartierville and St. Laurent, as well as those in the departments of communications, the inspector general, and general staff.

On Tuesday human resources staff, as well as those in the boroughs of Pierrefonds-Roxboro and Ile Bizard-Ste. Genevieve will walk off the job.  

The union has posted its full list of rotating strikes.

On March 1 all the white collar workers will take part in a one-day general strike.