Two of the worst villians to the Huskers I can remember are the guy who dove at Jarvis Redwine's knee when Redwine was on the wing of an extra point attempt, deliberately injuring him, and the guy who slammed Turner Gill down on the ground about 10 yards behind the guy Gill had handed off to, taking Gill out with a concussion.
Both were from Missouri. Missouri played us tough in many of those years. They also played us dirty.
http://www.huskerpedia.com/huskerdan/20081008dan.html confirms my memory.