1. Go to an area where there's a lot of people, but no guards.
2. Grab someone.
3. Beat them up until they fall and don't get up.
4. $Loot them.$ (Note, some people won't have any money.)
5. Repeat this as many times as you want...or until all the people are on the ground. Whatever comes 1st.
That's my tip! Hope it helped!