Are you kidding? It is an explicit halacha that it is permitted to report someone who is endangering the community even if it is only economically (CM 388,12 with Rema). See also seif 3 regarding someone who is compelled by the authorities to do so. Rav Moshe even permits being a tax auditor and turning over Jewish cheats as that is the person’s job (IM CM 92).
For a fuller discussion see “Gray Matter IV, Beit Din, The Mesirah Dilemma – Sefaria” online.