The younger Sicilian mafiosi became known for their reckless and undisciplined behavior, which gained unwanted attention for New York's crime families. The Zips had no qualms about murdering people who had been considered off-limits by the American Mafia, such as police officers, judges, and women and children. They were also known for using bombs to kill their targets. Although bombings were commonly used by the Sicilian Mafia, American mafiosi have usually shied away from bombs out of concern that they could put innocent people at risk. Zips were also known to have killed victims who were terminally ill. In the Sicilian Mafia, when someone is marked for death, that person cannot be allowed to die of natural causes.