Rejecting requests for leniency from the defense and the prosecution, a federal judge in Manhattan sentenced the former president of the nation’s largest municipal labor council to 10 years in prison on Wednesday, saying his abuse of the trust placed in him “staggers the mind.” “You had every opportunity,” said the judge, Richard J. Sullivan of Federal District Court, “and you used those opportunities and squandered them for your own benefit on a monumental scale.” The defendant, Brian M. McLaughlin, 57, who had also been an assemblyman from Queens, pleaded guilty in March 2008 to racketeering charges that included using...