MAY 23--When accused narcotics kingpin/hip-hop manager James Rosemond met last year with federal investigators to try and strike a cooperation agreement, he was peppered with questions about whether he knew of any criminal activity on the part of Rev. Al Sharpton, Sean “Diddy” Combs, and Wyclef Jean, according to an Internal Revenue Service agent who testified yesterday at Rosemond’s trial in Brooklyn federal court. Federal prosecutors elicited testimony from Agent Marc Van Driessche about what Rosemond said during a series of nine separate “proffer sessions” in the U.S. Attorney's office attended by various IRS and Drug Enforcement Administration agents, prosecutors,...