A DEA agent goes undercover in a prison to find out how the gangs are able to run drugs.
It turns out drugs are only a small part of the operation. The main thing is guns.
But it's government itself that's arming prison gangs --to build an army to enforce martial law.
In the end a prison riot becomes the excuse to begin the project.
--E. R. O'Neill
(It's not my theory: some Branch Davidians believe David Koresh founds out the government's secret plot to impose martial law and had to be killed by the DEA.)