Not sure about the downvotes, I've read some serious articles with very graphic pictures more than 20 years ago about mass organized organ harvests operations running very effectively as you describe.

It may not be some official state policy but rather some rogue effort from corrupt local officials in few places, but numbers were running in thousands per year at least, and they didn't even try to hide it too much since reporter(s) were allowed on execution fields and operating places. Murderers, drug traffickers, addicts and dissidents alike.

Given even back then critical organs were running in tens of thousands of dollars for mostly western/arabic receivers who were too low in donor list in their countries or didn't qualify (ie heavy smokers / drinkers refusing to quit). Imagine what some 20k or 50k meant in china some 25 years ago.