Hell Hath No Fury(1st Edition) (Multiverse) by DavidWeber, DrLindaEvans Paperback, 685 Pages, Published 2008 by Baen Books ISBN-13: 978-1-4165-5551-3, ISBN: 1-4165-5551-X
"It began with two men. They came from very different worlds--entirely different universes, in fact--one using sorcery and the other using mental powers and steam-age technology. They met in a virgin forest on a duplicate planet Earth. Neither side knows who shot first, but each blames the other, and it doesn't really matter, now, because war has begun. War between the universes is the last thing responsible leaders on either side want. ..."
"The prison business in the US is not based on locking up, punishing, or rehabilitating dangerous hoodlums. Follow the money and find how the prison-industrial complex fits into the New World Order of free trade and imprisoned people, the war on drugs, and capital flight."