The group is believed to have hit more than 50,000 victims.

The operation — with help from Palo Alto Networks' Unit 42 as well as cybersecurity firm Group-IB — marks the second action against the group.

The illicit carding market stands at $1.4 billion, researchers say, compared to $1.9 billion last year.

RedCurl's latest victims include one of Russia's largest wholesale companies.

The case appears to be the latest example of Russian authorities taking legal action against a prominent technology executive.

The law enforcement action focused on an organization that sells phishing services to less-skilled crooks.