What organization did the Soviet Union create in 1949 to exert more control over the economies of the Eastern Bloc?

Comecon

The Council for Mutual Economic Assistance

Explanation:

wiki says so:

The descriptive term was often applied to all multilateral activities involving members of the organization, rather than being restricted to the direct functions of Comecon and its organs.[2] This usage was sometimes extended as well to bilateral relations among members because in the system of communist international economic relations, multilateral accords – typically of a general nature – tended to be implemented through a set of more detailed, bilateral agreements.[3]

Comecon was set up initially to prevent countries in the Soviet sphere of influence from moving towards that of the United States. It was the Eastern Bloc's response to the formation in Western Europe of the Marshall Plan and the OEEC, which later became the OECD.[3]

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