OS : Linux
Distro : Slackware
Title : Sudores

Limit Users to use su

# groupadd wheel
# chgrp wheel /bin/su
# chmod 4750 /bin/su

File Name : /etc/sudores

root ALL=(ALL) ALL
%wheel ALL=(ALL) ALL
#%wheel ALL=(ALL) NOPASSWD: ALL

### EOF ####

Add user into wheel

# cat /etc/group | grep wheel
wheel::10:root,xwings