The July 1947 issue of Foreign Affairs magazine publishes and article written by George F. Kennan and published under the pseudonym "X", titled "The Sources of Soviet Conduct". The article introduced the term "containment" to widespread use and advocated the strategic use of that concept against the Soviet Union.
It expanded on ideas expressed by Kennan in a confidential February 1946 telegram, informally dubbed the "long telegram" for its size. Kennan's role in government precluded him from publishing under his name but his superiors granted him approval to publish the piece provided it was released anonymously. More