Brazil is a source country for men and boys trafficked internally for forced labor which accounts for most instances of modern slavery in Brazil. It is particularly prevalent in manual labour sectors such as construction, manufacturing, factory and domestic work and occurs in rural and urban areas, mainly through debt bondage schemes. In rural areas workers are immobilised in estates until they can pay off debts often fraudulently incurred; their identity documents and work permits are frequently retained; they are often physically threatened and punished by armed guards and some have been killed while attempting to flee. Debt bondage involves abusive labour contracting schemes operated by contractors known locally as empreiteiros or gatos, often engaged in other types of seasonal labour contracts.    Nelson, 46, was trapped with his family in forced labour on a coffee farm in Brazil.