Schools usually have measures such as an Isolation Unit (basically a very boring, remote classroom staffed by a Behaviour Manager, where kids who have been removed from lessons can get on with work set by their usual teachers).
We usually have 2-6 students in Iso. Most of them are there for truancy or post-exclusion, rather than as a result of disruptive classrom behaviour.
We don't have a great deal of disruptive behaviour, although the place was a bloody madhouse ten years ago.
What's changed?
We got a 'satisfactory' from Ofsted for teaching & learning - they said that much of the teaching was outdated, dull & complacent.
In the subsequent perfect storm of teacher-kicking by the SLG, many of us pointed out how unsupported we were by them - behaviour management consisted of sending a 'good' student to the front office to say that there was a riot in room 24 & could one of the SLG come, please?
More often than not, no-one did.
We now have 'outstanding' teaching & a behaviour policy, including an 'on call' system which is actually followed, so the kids know that being a dick in lessons will result in a day staring at the wall & filling in worksheets in the Iso.
But most importantly, the teaching is now far far better, & the kids don't misbehave because the lessons are worthwhile.
I'm not saying it's easy - it took us a few years - but it isn't rocket science, it doesn't require draconian new sanctions, & it was never down to teachers being thick...