Arnesen's resignation is the second high-profile departure announced by the club in a matter of weeks after long-serving assistant manager Ray Wilkins left earlier in the month.

BBC: Frank Arnesen resigns as Chelsea sporting director

And Matthew Friedrich, principal deputy assistant attorney general at the Department of Justice, said that while there had been several high-profile cases against chief executives, naming the conviction of WorldCom 's Bernard Ebbers as one example, criminal cases against hedge fund managers accused of fraud have been rare.

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