In 1972 a short grain crop in the USSR resulted in the Soviet Union quietly concluding grain purchasing contracts from a relatively small number of the secretive private multinational grain traders who dominated world trade in cereals. Because crop surveys in mid-spring had given the impression of a normal crop, FAS's agricultural attaché in Moscow chose not to follow up with additional crop observation travel, and thus missed a severe drought that set in after the last trip. As a result of this lapse, international grain traders and exporting nations were unaware of the Soviets' dire need for massive grain imports. By the time the scope of Soviet purchases became known, the USSR had locked in supplies at low, subsidized prices, leaving other importers and consumers scrambling for what was left at significantly higher prices. This event, known as the "Great Grain Robbery", led to creation in the Foreign Agricultural Service of a satellite imagery unit for remote sensing of foreign crop conditions, negotiation of a long-term grain agreement (LTA) with the Soviet Union, and imposition of an export sales reporting requirement for U.S. grain exporters. It also impressed on FAS the need for "boots-on-the-ground" observation of crop conditions in critical countries.