This is the movie Ross Hagan made back to back with 'Sidehackers' (aka. Five The Hard Way). It's a shameless rip-off of The Dirty Dozen, where a federal agent tasked with taking down a moonshiner (who is apparently the head of a moonshine criminal empire that can afford to pay the authorities to look the other way and whack any **** federal agent he pleases without any fear of repercussion) but can't stop getting his trained federal officers killed. So he gets the brilliant idea of press-ganging a local chain gang into helping him stop this evil moonshiner because.... uhh.... "they know the territory" and I guess the only thing that can stop a dumb Southern cracker is an even dumber Southern cracker?

This movie contains almost as much stupid as Sidehackers and The Hellcats, but is thankfully less rapey.

Copyright Status is unknown on this one, but I suspect it's either public domain or comparatively cheap since you can watch the entire movie free on Amazon Prime:
https://www.amazon.com/Devils-Eight-Christopher-George/dp/B009O5QVCS