The workers should shine a spotlight on all the so-called business secrets, the preparations for war, the connections among the war industries, the connections between big business and government regulatory agencies, and so on. The labor movement must be mobilized to expose contrived shortages and hidden stockpiles, to get at the truth behind the disastrous breakdowns inflicted on the population under capitalism. This becomes a school for the working class in preparing to manage and plan the entire economy under a workers government. You can't simply leap into workers management even when the workers hold political power. It takes time and experience.
Workers control is a school for the entire reorganization of production, for real planning.
The goal of the workers government is to expropriate the entire capitalist class and establish a planned economy, Trotsky said. But sometimes all hell will break loose under capitalism, posing the need to take a vital industry out of the hands of the capitalist profiteers. A particular industry will become crucially important in meeting people's needs, but criminally incapable of doing so. It may undergo a total breakdown. Something won't work.