Ruffian (noun)

1. A violent and intimidating person.
2. A member of a gang of criminals.

Origin:

Late 16th century: from italian ruffiano, from ruffiare "quarrel".

Examples:

1. The town was terrorized by a group of ruffians.
2. The ruffian threatened to harm the innocent pedestrian.
3. The police arrested the ruffian for mugging an old lady.
4. The young man had to defend himself against the ruffian on the street.
5. The witness identified the ruffian as the one who robbed the store.