Federal prosecutors on Tuesday charged three men in connection with the mass hack attack on JPMorgan Chase that took place in June 2014.

Gery Shalon, Joshua Samuel Aaron and Ziv Orenstein were indicted on 23 criminal counts, Reuters reports, which include computer hacking, securities fraud, wire fraud, identity theft, illegal Internet gambling and conspiring to commit money laundering.

Separately, prosecutors also charged Anthony Murgio for alleged fraud and conspiracy in connection with the hack.

The JPMorgan security breach, first revealed in August 2014, remains one of the largest in history. The hackers behind it gained access to the bank's internal systems for two months unnoticed by exploiting a flaw in its website. Private data was compromised for 83 million personal and small-business accounts.

The online brokerages E-Trade Financial and Scottrade also suffered from the cyberattack, according to The Wall Street Journal.

Shalon and Orenstein are Israeli nationals; Aaron is a U.S. citizen who has lived in Moscow and Tel Aviv. The Securities and Exchange Commission had previously filed civil charges against them. Murgio is based in Florida; in July federal prosecutors accused him of violating anti-money-laundering laws through his operation of an unlicensed bitcoin exchange.