MAY 10--Director Michael Moore is being investigated by the Treasury Department for traveling to Cuba in violation of a U.S. trade embargo. In a May 2 letter, the Office of Foreign Assets Control informed Moore that he was the subject of a civil investigation stemming from the filmmaker's March trip to Cuba. Moore reportedly traveled there with 9/11 rescue workers who were seeking medical care. The trip was filmed as part of Moore's documentary "Sicko," which examines the U.S. health care industry (and premieres at the Cannes film festival on May 19). In the letter to Moore, a copy of...