ILO violation 89, 98 : Early 2006, Calvo workers formed a union, SGTIPAC, legally registered with the Ministry of Labour and affiliated to the national center CSTS. Calvo retaliated immediately. Three union leaders were fired in February-March 2006; management refused to recognize or negotiate with SGTIPAC; and the company has taken legal action to intimidate union members and supporters while organizing a yellow union to combat SGTIPAC. Most recently, workers have been forced to undergo polygraph ("lie detector") tests regarding, among other themes, their company "loyalty" and attitude to the union.:
El Salvador 
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