Update: This story was updated to clarify that Robert S. Winner joined Akerman LLP on May 14.Akerman LLP is bolstering its white-collar crime and government investigations practice in Chicago with the addition of two former federal prosecutors.Sergio E. Acosta and Joel D. Bertocchi joined May 9, along with Robert S. Winner, a member of the firm’s national corporate practice group, who joined May 14.The three new partners bring the firm’s attorney head count in Chicago to 56.Acosta and Bertocchi joined from …