The primary objective of private prisons is profit - not rehabilitation, human rights, public safety, prisoner welfare, or community stability. Their primary duty is to their shareholders, not the public or their prisoners. Check out the PCWG website - they have a wealth of information about these folks. Look at the links and documents posted on this site revealing research into the treatment of prisoners in private detention facilities and prisons.
These prison profiteers are extremely hard to hold accountable under the best of circumstances, and once they own the town (co-opting not only the leaders, but also the people who depend on the prison for their economy), it's nearly impossible - they're in this for the long haul - they settle loyal career employees in these communities and infiltrate every policy-making board or body of government with pro-corporate votes. I wouldn't be surprised if they send CCA agents into targeted areas in advance to "salt", so to speak - to become part of the community, disseminate pro-privatization propaganda, identify power brokers and potential collaborators, and neutralize potential resistance before they even announce their designs.
This isn't just about what's on the table today - almost all these private prison proposals I've been reading about include some provision for considerable more capacity to be added in the future. They'll need to stack the deck before they can move their monster prisons in, though. There's a lot of money at stake here; this is big business. Do not be surprised at what they would be willing to do to those who stand in their way.
Government officials and business leaders colluding with them may also retaliate against resisters - there was an article here about a small citizens' group opposing a CCA prison getting sued by them and the county just a couple of weeks ago. Just one court appearance could bury a small community group operating on a shoestring budget - and they knew it - which seems awfully anti-democratic.
So, if you are with the resistance to private prisons you have our support and encouragement, but we can't protect you. They have the resources of the country's largest incarcerator behind them - one of the largest prison operators in the world - and extensive experience dismembering citizens' resistance groups through media propaganda, manipulation of "community leaders", and litigation. Proceed with caution.