Since school started this year/ she's been running with the wrong crowd.

They fall in with the wrong crowd, neglect their work.

And what about 18-year-olds who find themselves in jail because no one taught them not to run with the wrong crowd?

He hadn't done that since Gerry was in high school, running with the wrong crowd.

Was he thinking, 'I've been hanging out with the wrong crowd.

He ended living on the streets a lot and got involved with the wrong crowd.

My parents didn't want me to fall in with the wrong crowd.

He was doing poorly in school and running with the wrong crowd.

I got mixed up with the wrong crowd for a while.

The younger daughter is in high school and has been hanging out with the wrong crowd.