Industrial action has been ordered by the General Workers Union at the Marsa slaughterhouse and the kitchen of St Vincent de Paul Residence, Mount Carmel and Gozo General hospitals.
The action has been ordered because of delays and lack of enthusiasm to sign an agreement for workers to enjoy benefits which workers in the same grade had.
Several attempts were made in the past month for an agreement to be signed and the situation resolved.
The action will start on Tuesday.