Explanation here:
https://www.reddit.com/r/AntiSlaveryMemes/comments/1281axf/illegal_enslavers_in_brazil_hurrah_for/
TLDR: Basically, the CIA supported the 1964 Brazilian military coup and subsequent military dictatorship. Although I could not find any indication that the military deliberately implemented a forced labor regime, they did pass repressive authoritarian laws and created a situation that was conducive to an increase in illegal slavery, aka human trafficking.