In Brazil, the Ministry of Labor has begun to publish a list of "dirty" companies in an effort to publicly advertise who is caught engaging in slave labor. Brazilians are frequently promised high wages in exchange for working on coffee plantations, however once there they are subject to terrible working conditions and armed guards prevent them from leaving the property. Unlike other coffee exporting countries, Brazil has been willing to publish information on these farms which allows groups fighting slave labor to give their input on how to best tackle the problem.
See "Transparency Boosts Brazil's Fight to Tackle Modern Slavery on Coffee Farms", The New York Times, April 19, 2016