The Kidnapping of Sarah and Zach Lieberman was an abduction of Sarah Lieberman and her son Zach planned by William Rawlins and Billy Russo and executed by Anvil agents in order to track down Frank Castle.
When Liebermans learned about "Pete Castligione"'s true identity, Zach Lieberman contacted with NYPD. Using CIA resources, William Rawlins intercepted the call and informed Billy Russo about this. Russo sent his men to Lieberman house to take them.
At the Lieberman Residence, Anvil agent Jack, posing as police officer arrives and says they have received a call on the Frank Castle tipline from the address. He tried to question Zach but Sarah said he can't do that. When Jack said that they should come with him, Sarah ordered Zach to run. Soon, Jack chased after him but Sarah stopped him. She tried to threaten with a knife, but Jack's partner entered with Zach. Sarah surrendered and the two were abducted. At this time, Leo remains hidden and then flees the house.
Using Sarah's phone, Rawlins tracked down Castle's hideout and Russo sent agents there. But they were ambushed by Punisher, who killed all agents in hideout and called Russo. Billy proposed a trade – Sarah and Zach for Frank and Micro.