Juan Carlos Rojas is a member of the Coal Trade Union Sintracarbon. The trade union fights for the rights of workers of Cerrejón and the protection of the freedom of association. Following a meeting in Bogotá with members of Dutch trade union, CNV, the Dutch Embassy and executives from Cerrejón, Drummond and Grupo Prodeco-Glencore where they discussed the future of coal mining in the country, Igor Díaz received a pamphlet signed by paramilitary group "Aguilas Negras" threatening him and other colleagues and accusing them of being guerrilla group members.