Teaching in pru with 10 students alone

[Finallyfeelstrong]

I’ve been teaching in a pru for many years and just changed job role to take on a promotion.
Now the ‘promotion’ means I have the 10 most challenging students in the building. They have all at some point assaulted, harassed and threatened at least 2-3 teachers in the last 12months. Which has led to staff, understandably not wanting to be around them. As I’m senior I have been given the class in the central fishbowl room-which was used for meetings. But was given to me as it’s visible at all times for my safety.
The students are different ages and very challenging mix of personalities and violence.
I’m now locked in the room with them due to there level of disrespect and violence if roaming the school.
I have breakfast club, break and lunch as part of our teach them to communicate programme. As nobody wants to work with these I’m very much left alone and frowned at If they have left my enclosure when other staff and cleaners open the door.
I have to plan a ks3-4 curriculum and behaviour

I’m strughling with the mix of three students. If they are in the room separately we can all work and I can teach. But if more than one of this group is in its hard and I cannot get them to follow instructions. They run riot and nothing is achieved. It’s started to make me fell like I’m not any good in my job as I’m not helping and feel other staff look aon my room and the disruptive behaviour as a sign I’m inadequate and feel like Chinese whispering brigade is on hand and I have comments like I couldn’t do your work or is set to fail it can’t work and all very negative. It’s as though I’ve taken this as they are saying I’m inadequate and it’s starting to really get me down and question my role.
I get no break or lunch as nobody wants to be in this room with this mix

This is completely ludicrous.

1. The students need to be split so that the ring leaders are not together.
2. You need a T A with you so you can both work with a smaller group.
3. The students of course should be using the rest of the building.
4. You should not be locked in. This is actually against the rules. Many special school have been told in no uncertain terms that this isn't an acceptable behaviour strategy.

You need to put all your concerns in writing. If they won't act, leave.

This is really tough OP. Are you looking for advice on if you have grounds to demand change or how to deal with the class?

Both of the issues as the students are not benefitting in any way and I worry one will get harmed. I do not want to put any of my staff at risk either