I'm still a little confused about communism and it's corruption levels.
i assume it takes a "net" corruption level for your empire, and then evenly distributes it to all the cities.
this way, building courthouses reduces the net corruption of your empire, making the overall corruption of the empire less.
is this how it really is?
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"I've lived too long with pain. I won't know who I am without it. We have to leave this place, I am almost happy here."
- Ender, from Ender's Game by Orson Scott Card
That's my experience. Police Stations help too, of course.
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JB
I play BtS (3.19) -- Noble or Prince, Rome, marathon speed, huge hemispheres (2 of them), aggressive AI, no tech brokering. I enjoy the Hephmod Beyond mod. For all non-civ computer uses, including internet, I use a Mac.
In a big enough empire, communism is better (EDIT: with corruption levels) than the other govt types. It depends on how many cities and how spread out they are.