Centrally planned economies prior to the collapse of Communism in Russia and Eastern Europe did pretty well when it came to minimising unemployment. Unfortunately they did it in two ways that had results which were about as undesirable as unemployment itself.
The first was a combination of excess demand and fixed or controlled prices. That lead to a result which is wholly predictable and for reasons spelled out in introductory economics text books: shortages, queueing, etc.
Second, they made it difficult for employers to sack anyone. Unfortunately that meant some employees got stuck in (and indeed were quite happy with) relatively unproductive jobs. And that in turn made it difficult for employers with more productive jobs on offer to find the labour they needed.
A Russian economist called Popov suggested a solution, which was to let employers sack whoever they wanted, and then put the sacked workers onto relatively low paid public sector type work. The low pay, he claimed, would give the employees an incentive to seek the above mentioned more productive jobs.
Now what was Popov advocating? He was advocating JG!
I got the above information from an article in The Times, 20th Jan, 1981, entitled “The Russian who advocates unemployment” – not available online, far as I can see.