I can't find the specific submissions I saw previously but did find a plethora of articles like those below with example of lobbying:

http://www.salon.com/2014/04/15/america_on_lockdown_why_the_...

https://www.opensecrets.org/news/issues/prisons/

http://thinkprogress.org/justice/2012/08/03/627471/private-p...

There are a lot more out there across the years. The general impression is one of an 'industry' seeking to expand its operations and that just doesn't sit right to me as an outsider.