The prosectors probably grossly overcharged him, a lot of those cases were not going to be won at trial, or it would be pretty thin. The prosecutors in some cases, start small, and then just layer and layer and layer, then just get you to plead to the most serious charges, or the ones that they really want. Take guides from the Mueller case and the federal prosecutions that have been followed in here. He's not going to get life, but he will probably get a hard 8-10 years, unless a judge really, really dislikes him, and wants to give him the maximum. Maybe 15. Let me see exactly what he pleaded to.
Mr. Greenberg, 37, is facing 12 years in prison. But if his cooperation results in the prosecutions of others, the Justice Department can file a motion with the judge overseeing his case to ask for a shorter sentence. According to court documents filed on Friday, Mr. Greenberg could face perjury charges if he misleads investigators.
Conspiracy to commit an offense against the US isn't that serious of a charge, in this context, it probably means conspiring to defraud the tax collectors office or whatever he was up to. Max is 5 years on that. The plea agreement is public, you can see the point system in black and white too, which is always interesting. You get higher points for the offenses, lower ones for pleading guilty, cooperation, accepting responsibility.