They are what we call hot rodders.

He is not the rough motorcycle gang member he was before.

The battle robot JA went berserk.

I discouraged my sister from going out with the leader of the pack.

The police are going all out to keep down the rioting bikers.

Years ago, she used to hang around with a bunch of bikers.

Out of a sense of justice, I said to the leader of the biker gang: "What you are doing is a crime! Be ashamed of yourselves!"