The U.S. Marine Corps has opened an investigation into one of its service members after an investigation identified him as being involved with violent white supremacist groups.

A ProPublica and Frontline investigation published earlier this month found that 19-year-old Lance Corporal Vasillios Pistolis has been linked to several neo-Nazi groups.

A spokesperson for the Naval Criminal Investigative Service told ProPublica that the service is looking into the allegations against Pistolis, but declined to comment further on the open investigation.

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ProPublica found that Pistolis has been involved with the National Socialist Movement, the Traditionalist Worker Party and Atomwaffen Division, an extremist group which was linked to a string of killings earlier this year. The fascist group is known to focus on advanced weapons training in preparation for a “race war.”

Pistolis was also reportedly involved in assaults at the violent Charlottesville white supremacist rally last summer and allegedly bragged online about assaulting a transgender woman at the rally.

The outlet also found at least six other current and former service members who are Atomwaffen members or otherwise linked to the group.

Rep. Keith Ellison (D-Minn.) has called on Defense Secretary James Mattis to investigate the alleged white supremacist activities, following the report.

“The involvement of service members in white supremacist or other hate groups is cause for significant concern, particularly given their combat and weapons training,” Ellison wrote in a letter to Mattis sent last week.