Source of a 1973 crisis

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Possible Answers: OPEC.

Random information on the term “OPEC”:

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The “Seven Sisters ” was a term coined in the 1950s by businessman Enrico Mattei, then-head of the Italian state oil company Eni, to describe the seven oil companies which formed the “Consortium for Iran” cartel and dominated the global petroleum industry from the mid-1940s to the 1970s.[1][2] The group comprised Anglo-Persian Oil Company (now BP); Gulf Oil, Standard Oil of California (SoCal) and Texaco (now Chevron); Royal Dutch Shell; and Standard Oil of New Jersey (Esso) and Standard Oil Company of New York (Socony) (now ExxonMobil).[3] [4]
Taken from Wikipedia