You need to set guildlines/rules/standards and when they aren't met, document failures. You'll need to have good reason to let someone go.
Wouldn't hurt to bring in the so called leaders and straighten them out. Let them know what you expect from each on an individual level. If they aren't meeting said requirements Demote them and get someone who will.
Ask for opinions of what the works would like to see to improve the environment.
The excuse," That's how we used to do it!" not be allowed.
-Andy
