The price of defeat.
Reeducation camps were concentration camps where anyone that might not support the Communist takeover was sent to be browbeaten into submission. While a lot of South Vietnamese
Army Officers and government workers (usually low level officers and/or bureaucrats) were sent there, so were school teachers, doctors, shop owners, village elders and their families, anyone that had worked for the Americans during the war (interpreters, house girls, mechanics, etc). The number of people sent to reeducation camps is not really known, but probably exceed a million. Those that did not respond well to the physiological torture never graduated back into civilian life. They disappeared. More the 100,000 South Vietnamese simply vanished.
More then a million victims not sent to reeducation camps were sent to "New Economic Zones," marginal land in the boondocks where they were forced to scratch out a subsidence living while attending reeducation classes and being forced to dig up landmines left over from the war.
Those that could get to the coast and had a little money bought passage on the first leaky scow headed into the South China Sea away from the new worker's paradise. More then a million South Vietnamese washed up on every beach from Japan to Australia over the next five years. About half of those setting out as refugees died in the attempt from starvation, dehydration, pirates, and sinking vessels.
The liberal press that agonized over every Viet Cong casualty during the war ignored this huge human tragedy as much as possible. The sheer numbers made it impossible to completely sweep under the rug.