An Iowa man was sentenced to 37 years in the clink for mailing bombs and threatening letters to mutual fund managers at Janus Capital Group and American Century Cos. in a bid to influence stock prices.

John Tomkins, 48, of Dubuque, who was convicted last May of 12 counts including possession of an unregistered explosive device, was sentenced today in federal court in Chicago by U.S. District Judge Robert Dow. Tomkins acted as his own lawyer and testified at his two-week trial, admitting that he mailed the letters while disputing the prosecutors’ claim that he sent viable pipe bombs to the mutual-fund companies.

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