The state must show zero tolerance for the use of undeclared work and disregard for safety rules, Social Minister Borislav Gutsanov said in a greeting published on the ministry's website.
He added that workplace safety and compliance with labor rights are essential.
Over 13,000 inspections were carried out in the first quarter of the year, during which 914 cases of work without an employment contract were identified.
The rights of workers are not given for free and today we celebrate this battle, Gutsanov emphasizes.