The employee whose rights have been violated may apply to both the competent authority of the country to which he has been posted to carry out work (usually – the Labour Inspectorate) and the competent authority of his/her respective country (in Latvia – the State Labour Inspectorate).
If a dispute with the employer is not settled by negotiation between the employee and the employer, or the employee, the employer and the Labour Inspectorate, then the employee may appeal to the court. According to the Latvian Civil Procedure Law, employee claims for the recovery of wages and other claims arising from an employment relationship or are related thereto, are exempted from the payment of court fees.
In addition, an employee whose rights have been violated may apply to the Free Trade Union Confederation of Latvia.
Refer to Ministry of Welfare:
http://www.lm.gov.lv/eng/index.php?option=com_content&view=article&id=83473
Latvijas Brivo Arodbiedrìbu Savieníba
Union of Independent Trade Unions of Latvia