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Millions of illegal-immigrant U.S. workers are vulnerable to exploitation because the federal government fails to protect them, advocacy groups said in a petition to an international human-rights body. The document was filed on Wednesday with the Inter-American Commission on Human Rights, on behalf of petitioners including six illegal immigrant workers. The human rights commission, an arm of the Organization of American States, has scant powers and can do little more than publicize its findings. But the American Civil Liberties Union said the aim of the petition was to put the U.S. government's human-rights record under the spotlight and demand accountability.