New York: Citigroup Inc has hired JPMorgan Chase Co’s Viswas Raghavan as head of banking and executive vice-chairman, poaching a key rival as chief executive officer Jane Fraser presses ahead with the bank’s biggest restructuring in decades. Raghavan, who is expected to start at the bank in the summer, will also join the firm’s executive management team and report directly to Fraser, Citigroup said in an internal memo Monday.In his new role, Raghavan will run one of the bank’s five core business