pickpocket
US /ˈpɪkˌpɑː.kɪt/
UK /ˈpɪkˌpɑː.kɪt/

1.
a person who steals from the pockets of unsuspecting victims in public places
:
•
Be careful of pickpockets in crowded tourist areas.
•
The police arrested a notorious pickpocket near the market.