troublemaker

A troublemaker within a group is always bad news.

I put the boy down as a troublemaker as soon as I saw him.

She had automatically labelled the boys as troublemakers.

troublemakers who incite riots; inciting workers to strike.

The troublemaker has gone for good. I regretted that I had lost my temper. They will have finished by the time we arrive.

Because his older brother had been a troublemaker at the school, Paul was automatically tarred with the same brush. It wasn’t fair!