The big one that leaps to mind was the famines with the communist experiments in the 20th century. But there are other, smaller examples that crop up disturbingly regularly. Sri Lanka's fertiliser ban was a jaw-dropper; Zimbabwe redistributing land away from whites was also interesting. There are probably a lot more though, messing with food logistics on the theory there are more important things than producing lots of food seems to be one of those things countries do from time to time.

People can argue about the moral and ideological sanity of these things, but the fact is tolerating economic inefficiencies into the food system can quickly leads to there not being enough food.

The big ones that leapt to my mind were the Great Irish famine the duration of which food exports to Great Britain were higher than food imports, Bengal famine (the Brits again), and starvation of Native Americans through targeted eradication of the bison.