1. Burglary: Sikes is a skilled burglar and pickpocket who operates as part of a gang led by Fagin. He breaks into houses and steals valuables, often targeting upper-class residences.
2. Robbery: Sikes is involved in robberies, where he and his accomplices steal money and other valuables from individuals or businesses.
3. Assault and Battery: Sikes is known for his violent tendencies and frequently resorts to violence to achieve his criminal objectives. He does not hesitate to assault or harm anyone who gets in his way or poses a threat to his operations.
4. Murder: Sikes commits murder during the course of a bungled robbery. He accidentally kills a young woman named Nancy, who is also involved in the gang's criminal activities.
5. Attempted Murder: Sikes attempts to kill Oliver Twist, the protagonist of the novel, on Fagin's orders. He tries to strangle Oliver but is interrupted before he can succeed.
6. Child Exploitation: Sikes and Fagin exploit young children, including Oliver, for their criminal purposes. They use the children as pickpockets and accomplices in their criminal activities, taking advantage of their innocence and vulnerability.
7. Fencing Stolen Goods: Sikes is involved in fencing, which is the illegal trade of stolen goods. He disposes of stolen items by selling them to receivers who resell them for profit.
8. Accessory to Murder: Sikes becomes an accessory to murder when he assists Fagin in disposing of Nancy's body after her accidental killing. He helps to cover up the crime and protect Fagin from facing justice.