Alaska ? The oil services executive at the center of a federal investigation of corruption in Alaska politics was sentenced Wednesday to three years in prison and fined $750,000.

Bill Allen, 72, testified on behalf of the government in three cases, including the trial of former U.S. Sen. Ted Stevens, whose charges were dismissed earlier this year when the Justice Department admitted it failed to turn over favorable evidence to Stevens’ defense team.

U.S. District Court Judge John Sedwick said Allen’s fine would have been higher if sentencing guidelines had allowed it. Allen’s prison sentence was revised downward because of his cooperation with prosecutors from the day he was confronted with evidence against him, and his acceptance of responsibility for the crime.