I have read many accounts of German tanks stopping over foxholes then gunning the engine and grinding the occupants to death. Also, if the ground was too hard they would put the tank in neutral, gunned the engine, and suffocated the occupants.
In my experience, in CMx1 tanks do not cause casualties when they hit a unit, but instead just cause them to run to a new place. Then again, I try to keep my tanks away from infantry. (well, at least out of crush distance)