Confederação Nacional dos Trabalhadores na Agricultura is the largest federation of agricultural workers' labor unions in Brazil. It represents 20 million rural workers in 27 associations and around 4 thousand unions.
The CONTAG was founded on December 22, 1963 in Rio de Janeiro. At the time there were 14 associations and 475 rural workers' unions. With the 1964 military coup, the federation and its unions were taken over by the government. Many union leaders were imprisoned or forced into exile. From Wikipedia
