Apparently for fixing prices of seat-belts sold to Japanese auto makers' US plants. And we're actually spending tax money on incarcerating foreign nationals who didn't physically injure anyone in the US. This is profoundly retarded -- shame the Japanese authorities don't tell us to go copulate ourselves with a fire axe, and that if we want 'em, we can come get 'em ourselves...

U.S. takes action in two auto parts price-fixing cases | Reuters

If anything, we should be grateful to them for giving Ford and GM a tiny bit of a leg up, since this particular instance only applied to US subsidiaries of Japanese auto makers.