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Enron ' s principal bankers , including JP Morgan Chase and Citigroup , and along with numerous other Enron advisers , have already been sued by the company ' s shareholders for allegedly helping the company hide debt , and they face investigations from regulators over their involvement .
 bankers: defendant; shareholders: plaintiff
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: sue 
  Option: plaintiff, adjudicator, defendant, place 
Text: {0} 
Answer:
 bankers: defendant; shareholders: plaintiff