According to Socialists, what parts of the economy should the government control?

Most of it.

Explanation:

A socialist economy is a system of production where goods and services are produced directly for use, in contrast to a capitalist economic system, where goods and services are produced to generate profit (and therefore indirectly for use). "Production under socialism would be directly and solely for use.

it was the "4. potsdam" conference that demanded the unconditional surrender of japan, since it was clear that the japanese would continue to find until the very last man otherwise.