On 22 February 1946, George F. Kennan, the chargé d’affaires at the American Embassy in Moscow and an expert on Russia, sent the longest telegram in State Department history. In the “Long Telegram,” as it became known, Kennan presented an analysis of Soviet policy that, over the next year, heavily influenced the Truman administration’s Cold War policies.
In summary, we have here a political force committed fanatically to the belief that with U.S. there can be no permanent modus vivendi, that it is desirable and necessary that the internal harmony of our society be disrupted, our traditional way of life be destroyed, the international authority of our state be broken, if Soviet power is to be secure. This political force has complete power of disposition over energies of one of the world’s greatest peoples and resources of the world’s richest national territory, and is borne along by deep and powerful currents of Russian nationalism. In addition, it has an elaborate and far-flung apparatus for exertion of its influence in other countries, an apparatus of amazing flexibility and versatility, managed by people whose experience and skill in underground methods are presumably without parallel in history.
The complete Long Telegram can be read here.