It was Lenin.
It cannot be Stalin, because Lenin is his predecessor and it is with Lenin that the central planning and communism was introduced to what was then Russia.
Karl Marx and Engels created together communism, but didn't introduce it specifically to Russia. They wrote their ideas and they spread all around the world and Lenin was inspired by them.
<span>The need for the Constitution grew out of problems with the Articles of ... on those powers to assure that no one branch of government gained supremacy</span>
The answer is letter a i think
Soviet Union and the United States