James von Brunn , the white supremacist who killed a security guard at the Holocaust Museum in Washington , D.C. on June 10 , 2009 , posted an article on another site questioning the citizenship of President Barack Obama ( a view held by so-called " birthers " ) ; the article was then pasted into a thread on Free Republic . The thread was deleted by moderators after the shooting , but later restored when a review found that it had not violated posting guidelines
killed a security guard
United States Holocaust Memorial Museum shooting
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