Just find the biggest offender who has pissed off everyone.
Make an example out of him. Completely redicule him in front of others and even throw their belongings on the floor. Use most profane language, Steve Jobs style. Make sure you explain loudly why he is being treated like this and leaving the company.
To make it clear, yell at him, "so you want to be a rebellious tech bro?"
Be careful why doing this:
1. Make sure your example person is a man because people sympathise more with women
2. Make sure he looks unfriendly because people sympathise with friendly people.
You want people to comply, be an authority who they fear.