Senator Petro vehemently opposed the government of Álvaro Uribe. In 2005, while a member of the Chamber of Representatives, Petro denounced the lottery businesswoman Enilse López (also known as "La Gata" [the cat]). As of May 2009, she was imprisoned and under investigation for ties to the (now disbanded) paramilitary group United Self-Defense Forces of Colombia (AUC).