The US Supreme Court said it would not second-guess the government's policy of secrecy in holding hundreds of foreigners after the September 11 attacks. None of the more than 700 illegal immigrants was charged as a terrorist, and the Justice Department's inspector general concluded last year that the government had trampled on a law stipulating such detentions be limited to 90 days. The high court on Monday turned down a request to review the secrecy surrounding the detainees, nearly all Arabs or Muslims, who were picked up in the United States following the attacks on the World Trade Center and the Pentagon. Most were eventually deported for immigration violations. The government refused to disclose whom it held and why.