How do you kill opponents in Mafia Wars?

In Mafia Wars, you can eliminate opponents by engaging them in fights or using the "attack" option against players on your rivals list. To be successful, ensure you have strong weapons, armor, and skills to increase your chances of winning. Additionally, utilizing health recovery items and leveling up your character can enhance your combat effectiveness. Strategically choosing targets based on their strength and resources can also improve your chances of victory.