Citigroup Inc. has made up our minds to go out the distressed-debt buying and selling industry, the most recent retrenchment in Leader Government Officer Jane Fraser’s effort to reshape the company in pursuit of upper returns.The transfer, described via other folks briefed at the topic, will take away one of the most key gamers in distressed-debt markets, and follows a contemporary choice via the New York-based financial institution to get out of municipal bond buying and selling and underwriting.