https://cointelegraph.com/news/407-million-fine-judge-rules-ponzi-scheme-on-bitcoin-savings-and-trust
A US Federal Judge has ruled in case is SEC v. Shavers et al, U.S. District Court, Eastern District of Texas, No. 13-00416 that the Bitcoin Savings and Trust was indeed a criminal enterprise and Shavers was guilty of running a Ponzi Scheme.