Right to work and to free choice of employment 

The right to work and to free choice of employment  is enshrined in Article 23 of the Universal Declaration of Human Rights.

In cases of violations of this human right (explained here),

All persons may turn to the these organs/institutions:

Committee on Economic, Social and Cultural Rights

Women may turn to:

Committee on the Elimination of Discrimination Against Women

Migrants may turn to:

Special Rapporteur on the human rights of migrants

Migrant workers may turn to:

Committee on the Protection of the Rights of All Migrant Workers and Members of Their Families 

In the context of employment and profession:

International Labour Organization (ILO)

Indigenous people may turn to:

Special Rapporteur on the situation of human rights and fundamental freedoms of indigenous people

Persons being in an African country may turn to:

African Commission or Court on Human Rights and Peoples’ Rights