I heard about deer drives when I moved here from the big city. A criminal case crossed my desk, charging a guy for shooting a "driver" with a 12 gauge slug. Man, did it make a mess of the victim. Don't recall the charge.
Game warden explained that the idea is for a group to go through the woods perpendicular to a small number of shooters. They march through the wooded area, making noise, driving deer towards the shooters. In a perfect scenario, any shot goes in front of the group, so no risk. On the other hand, an excited shooter and things can go really bad.