The activist pleads guilty in two arsons and will serve at the Sheridan federal prisonTre Arrow, a radical environmentalist who was once one of the FBI's most-wanted fugitives, pleaded guilty Tuesday to two counts of arson. Appearing before U.S. District Judge James Redden, Arrow agreed to serve to 78 months in federal prison, with credit for time served since March 2004 in jails in Canada and the United States. Arrow, who will be formally sentenced Aug. 12, will serve about two years and four months at the Sheridan Federal Correctional Institution. His sentence could be further reduced by 54 days...