Recruit attackers. The fact that they attacked implies no hostility. Rather, it suggests they're simply playing the game as it was designed. Mafia Wars frequently notifies victims of attacks using the Facebook profile name, enabling a direct connection to the 'Add as Friend' process, and many characters use a name that is searchable in Facebook.
A recent feature on the Mafia Wars home page is a built-in recruitment tool in the 'Mafia Status' window to the right of 'Player Updates'. This new element flags players who want to join the family. Simply click the 'Add' button and another soldier is ready for duty.
Using organic strategies systematically, the 501 goal is readily achievable fairly quickly without risking Facebook suspension.
If this article was helpful, check out Make a Killing in Facebook Mafia Wars for tips on how to accumulate billions to fund more high-value weapons and armor.
http://suite101.com/growing-a-family-in-facebooks-mafia-wars-a123267