Yes. Extortion in the workplace and non-payment of salaries in the informal sector are common, especially, when the employment is unofficial. In such cases, the international economic human rights standards and a Labour Code can protect from the economic abuse.
The UN Committee on Economic, Social and Cultural Rights guarantees fair and favourable working conditions that include freedom from violence and harassment. It also identifies specific groups of workers, who should receive fair, favourable and non-discriminatory working conditions from the state. These groups include migrants, women, the elderly, people with disabilities, home workers, workers of the informal sector, self-employed, refugees, etc.