Who is fagin and his gang?

Fagin is a character from Charles Dickens' novel "Oliver Twist." He is a cunning, elderly man who leads a group of child thieves in London, training them to pickpocket and commit various forms of theft. Fagin exploits the vulnerable children, including the protagonist, Oliver, to serve his own interests. His character represents the moral decay and social issues of Victorian society, particularly the exploitation of the poor.