Belfer Center experts on security, intelligence, and cybersecurity issues were interviewed on the recent leak of classified military intelligence documents allegedly by Airman Jack Teixeira.

Calder Walton explains why, as the 20th anniversary of the U.S.-led invasion of Iraq passes, it is useful to understand how China's intelligence and national security establishment reacted at the time.

Hostile foreign states are using weaponized information to attack the United States. Russia and China are disseminating disinformation about domestic U.S. race relations and COVID-19 to undermine and discredit the U.S. government. These information warfare attacks, which threaten U.S. national security, may seem new, but they are not. Using an applied history methodology and a wealth of previously classified archival records, this article uses two case studies to reveal how and why a hostile foreign state, the Soviet Union, targeted America with similar disinformation in the past

Immediately after Russia’s invasion of Ukraine last month, the U.S. government expelled 13 Russian diplomats working at the United Nations (UN). It did so on the grounds they were Russian intelligence officers or operatives working under diplomatic cover. We do not know details about their alleged activities, but we do know something for certain: the Kremlin has a long history of using the UN for espionage.

Calder Walton recounts the history of Cold War intelligence and explains the role of intelligence in the context of the Russian invasion of Ukraine.

Calder Walton writes that Washington's fears of Russian false-flag operations are rooted in history. Ukraine wouldn't be the first place where Moscow faked an attack to start a war.

Protests against racism erupt in cities across America. A White House, under siege, believes a vast conspiracy is at work, and, to uncover it, instigates a policy to spy on Americans. This is not the United States in 2020, but half a century earlier. Using a wealth of declassified records, this article explores a domestic intelligence collection program (CHAOS) instigated by two  successive US administrations and conducted by the Central Intelligence Agency in the late 1960s and early 1970s.

Calder Walton unravels the details of Operation NEPTUNE, a disinformation campaign by the former Czechoslovak intelligence service intended to smear public figures in West Germany through forged Nazi documents.

Covert action has long been a controversial tool of international relations. However, there is remarkably little public understanding about whether it works and, more fundamentally, about what constitutes success in this shadowy arena of state activity. This article distills competing criteria of success and examines how covert actions become perceived as successes.

Calder Walton and Christopher Andrew recall George Blake, who died last month at the age of 98. He was a Soviet double agent defined by his dangerous loyalty not to money, nor homeland, but to ideological principle.