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In addition to Brownfield, the Bulgarian Minister had meeting with Eric Holder, Attorney General of the United States, John Brennan, Chief Counterterrorism Advisor to President Barack Obama, Michael Daniel, Special Assistant to the President and Cybersecurity Coordinator, Janet Napolitano, United States Secretary of Homeland Security, Eric Boswell, United States Assistant Secretary of State for Diplomatic Security, and with Daniel Benjamin, Coordinator for Counterterrorism at the Department of State, with congressmen from the group for friendship with Bulgaria and with the chair of the Senate Internal Security Subcommittee, and visits of DEA and the National Center at the Department for Internal Security.
That same year, the Senate Internal Security Subcommittee included his name among the 82 most active sponsors of Communist front organizations.
The Senate Internal Security Subcommittee later investigated Lattimore, declaring in 1952 that "Owen Lattimore was, from some time beginning in the 1930s, a conscious articulate instrument of the Soviet conspiracy.