The neo-Nazi group The Base was identified as a domestic extremism concern in a non-published version of a recent report by U.S. spy agencies but not mentioned in a public version of the same report, three sources familiar with both versions said.
The non-public version of the report also reported that Americans had traveled to Ukraine to fight with pro-Russian forces against the country's elected central government, two of the sources said.
The public version of the report, principally compiled by the National Counterterrorism Center, the FBI and the Department of Homeland Security, was released by the Office of Director of National Intelligence earlier this month.