Pink thief (1982)

A group of young people are helped to illegally immigrate from China to Hong Kong by a local gang, but when they arrive they are immediately abused by the gang and paid little for the tasks they are given. Struggling to survive, the group turn to petty crime to make ends meet. When one of the group accidentally picks the pocket of a chief detective, he decides to use the group of desperate immigrants to help him infiltrate their gang.