I had two women who had wanted the previous caretaker manager to be kept on and not me. We were in an office together, with the previous incumbent still there. Awkward. She barely spoke to me, and in the end did a full on ignore, after telling us all that she always got revenge when she was wronged, even if it took years...sinister.
She was caught out sabotaging some of our immediate manager's work too, wrong versions of reports being sent out, that sort of thing, which could be explained away as a mistake. She never made mistakes....
They all continued to sit together, whispering and being really petty about things like tea making, always leaving me out. They would always moan about changes I made and in the end, we had a final showdown with senior managers, when their true colours came out. They had numerous things to say about me which were just daft, as in I was too cheerful and didn't respect them because I made decisions which they didn't agree with...ie, behaving as a manager. It was so nasty that the senior managers ended by apologising to me for their behaviour in the meeting.
Shortly after that, they both got other jobs elsewhere in the organisation, and I gave them good references through gritted teeth.... I’ve got a great team now and I can't tell you the difference , all pulling together instead of sulking and resentment.
Sadly, one of them had previously worked with me on another team, when we got on really well and I’d supported her through some really tough personal circumstances and really had her back when they were looking at redundancies... so it was quite the stab in the back. The other one just never disengaged from her old manager and clearly felt I had stolen her job (which she wasn't qualified for).
No matter how gently I introduced change, and how carefully I acknowledged their great work, it was never going to be better. Kill them with kindness? No, four or five years on, I would still rather like to slap them and hope,I never set eyes on them again.