[ses4j]

From a personal/financial perspective, you're probably best just walking away: hiring lawyers is expensive. But walking away silently enables them up to repeat their crimes. Reporting them criminally and giving them a record will make it harder for them to victimize more people.

[Silhouette]

Careful, please. If the business has been involved in potentially illegal actions, and OP is or has been involved with the business in ways that aren't necessarily entirely clear or documented, then OP might have all sorts of reporting requirements and/or responsibilities in relation to those actions.

This is the kind of situation where you really do need at least an initial consultation with a suitable lawyer to know where you stand. It might well be best to have the lawyer also write the appropriate letters to notify the appropriate people of appropriate things in the appropriate ways and without saying anything inappropriate that will get OP in trouble unnecessarily.