It said it had received a request from a member of the public for the sentence to be reviewed.

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Before she announced the sentence, Maersk Alabama crew member Colin Wright told the court he was "not the same person I used to be and I never will be".

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Heymann received a Department of Justice award for his convictions of five defendants in the case, which included a 15-year sentence for the most active member of the team, Alberto Gonzalez.

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Among the fallen: former hedge fund billionaire Raj Rajaratnam, currently serving an 11 year sentence, and former Goldman Sachs board member Rajat Gupta.

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Martin Horwood, a member of Parliament representing Sandiford's Cheltenham constituency in western England, called the sentence a shock and said he would raise the case with Foreign Secretary William Hague.

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Hiram Monserrate, also a former City Council member, pleaded guilty to conspiracy and mail fraud charges, receiving a two-year prison sentence.

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