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“I just couldn’t believe they could fly people in to sit at our desks and take over our jobs exactly,” said one former worker, an American in his 40s who remains unemployed since his last day at Disney on Jan. 30. “It was so humiliating to train somebody else to take over your job. I still can’t grasp it.”

Disney executives said that the layoffs were part of a reorganization, and that the company opened more positions than it eliminated.

But the layoffs at Disney and at other companies, including the Southern California Edison power utility, are raising new questions about how businesses and outsourcing companies are using the temporary visas, known as H-1B, to place immigrants in technology jobs in the United States. These visas are at the centre of a fierce debate in Congress over whether they complement American workers or displace them.

According to federal guidelines, the visas are intended for foreigners with advanced science or computer skills to fill discrete positions when American workers with those skills cannot be found. Their use, the guidelines say, should not “adversely affect the wages and working conditions” of Americans. Because of legal loopholes, however, in practice, companies do not have to recruit American workers first or guarantee that Americans will not be displaced.

Too often, critics say, the visas are being used to bring in immigrants to do the work of Americans for less money, with laid-off American workers having to train their replacements.