They're killed and expelled with good reason. In the past missionaries were political operatives who assisted with the takeover and colonization of areas around

They're killed and expelled with good reason. In the past missionaries were political operatives who assisted with the takeover and colonization of areas around the world including African countries and the Americas. Many of these missionaries in China (and other countries like DPRK) that are expelled are expelled because they failed to follow the proper laws around registering themselves (I'm going to veer into personal anecdote here, but I've heard missionaries bragging -- in I'm such a bad ass sense -- about operating underground churches).