in January, Halliburton won a contract to drill at a huge Iranian gas field called Pars, which an Iranian government spokesman said served the interests" of Iran. "I am baffled that any American company would want to have employees operating in Iran," says Sen. Susan Collins, R-Maine. "I would think they'd be ashamed." Halliburton says the operation - videotaped by NBC News - is entirely legal. It's run by a subsidiary called "Halliburton Products and Services Limited," based outside the U.S. In fact, the law allows foreign subsidiaries of U.S. corporations to do business in Iran under strict conditions. Other U.S. oil services companies, like Weatherford and Baker Hughes, also are in Iran. And foreign subsidiaries of NBC's parent company, General Electric, have sold equipment to Iran. For Halliburton to have done this legally, the foreign subsidiary operating in Iran must be independent of the main operation in Texas. Yet, when an NBC producer approached managers in Iran, he was sent to company officials in Dubai. But they said only Halliburton headquarters in Houston could talk about operations in Iran.

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