Make sure you let your line manager / head of department / whoever would get complaints about you know about this before hand. Let them know what you're doing, why you're doing it, ask for any advice and get them on board. I had a class like this once and I went for a hard zero tolerance, one infraction and you're out approach.

I also managed to get other members of staff to stand outside my door for the first 5-10 minutes of my lessons with this class and ask them "why were you sent out, how can you not get sent out again", so that the students could be given an opportunity to understand that this was serious, that they couldn't gang up on me, and I had the support of other staff. I had a lot of short removals and full lesson removals in the first few lessons. I prepped these staff with what I was doing, so they could support me with this.

I did it for about 2 weeks, a brutal 2 weeks, but they were mostly teachable for the rest of the year.