Colombia’s main labor group voiced support Monday for U.S. universities that have banned the sale of Coca-Cola while allegations of workers’ abuses were being investigated.

“Coca-Cola is a frequent violator of union rights and that’s why several universities in the United States have decided to protest their conduct,” said Fabio Arias, vice president of Colombia’s CUT trade union confederation, which represents 623 unions and 550,000 workers.