Well heavy industries of some kinds. Industries which did not make any profit, but kept running due to government largesse. That is, by gobbling taxpayers' money. Industries which were all run by the government, which means being run by bureaucrats and not industrialists. Industries which couldn't hope to compete with anything else in the world, and so the economy had to remain closed to any sort of competition. Industrial units which were assured lots of money from the taxpayers, and assured of monopoly.
So such industries could keep churning out ambassadors for the rich and influential people to drive, while not making any profit, but paying their employees by taxing the citizens. But they could not bring about a Toyota that churns out cars affordable to everybody, rich or poor, because such an enterprise requires that the industry is run by industrialists and businessmen, not government bureaucrats who's only qualification was having passed the civil service exam.
Until private enterprise was allowed to spread its wings, the country languished.