NEW YORK (CNN) -- At first glance, former New York Mayor and 2008 presidential hopeful Rudy Giuliani wouldn't seem to have much in common with Venezuelan President Hugo Chavez.

One is considered one of the heroes in the aftermath of the Sept. 11, 2001, terrorist attacks, a leader who walked to Ground Zero while the World Trade Center towers still smoldered. The other is a vehement anti-American who has called President Bush a "madman" and "the Devil" and flaunts his association with longtime U.S. adversary Fidel Castro of Cuba.

But there is a link between the two, according to the Texas Ethics Commission. Giuliani's law firm, Bracewell and Giuliani, is making money by lobbying American lawmakers on behalf of Citgo Petroleum Corp. of Houston. Citgo is the American subsidiary of Petroleos de Venezuela -- the state-owned Venezuelan oil company.

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