(CNN) The brother of a State Department official linked to a white nationalist group by a civil rights organization tells CNN he reported his sibling to the FBI out of concern about his hateful views.

Matthew Gebert, the State Department employee, has been placed on administrative leave from his job as a foreign affairs officer in the Department's Bureau of Energy Resources after the civil rights organization's made the claim

Gebert's brother, Michael Gebert, told CNN on Thursday that details in the extensive report released last week by the Southern Poverty Law Center's Hatewatch initiative are accurate.

Hatewatch alleged that Matthew Gebert "oversaw the Washington, DC-area chapter of a white nationalist organization, hosted white nationalists at his home and published white nationalist propaganda online." According to the report, he used a pseudonym -- Coach Finstock -- to express "a desire to build a country for whites only."

'I was just so angry'

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