The head of financially troubled American International Group, the insurance firm that most benefited from the federal bailout while still paying hefty bonuses to executives, will testify before U.S. Rep. Paul E. Kanjorski’s congressional panel Wednesday. Chief Executive Officer Edward M. Liddy is sure to field questions from members of the Capital Markets, Insurance and Government-Sponsored Enterprises Subcommittee about millions of dollars in bonuses. Mr. Kanjorski, D-11, of Nanticoke, chairman of the subcommittee, said Monday he warned Mr. Liddy against paying the bonuses in a conversation in January. Mr. Kanjorski said bonuses could anger members of Congress who might eventually...