A Bergen County man who sued the United States for allowing “socialists and Muslims” to hold jobs in federal government has been charged with threatening a federal judge.

Paramus resident William Kaetz is charged with threatening to assault and kill a federal judge. Kaetz also allegedly threatened to publicize the judge's home address. The judge wasn’t identified by the U.S. attorney’s office in New Jersey.

Kaetz allegedly sent a letter and left a voicemail for the judge last month regarding a case. Authorities say that he then sent an email on Sunday to the judge’s personal email account and to others claiming that the judge has been “avoiding” his case.

The email read in part, “[Judge 1] is a traitor and that has a death sentence. I would rather use the pen than the sword, but…there will come a time to take down those people that fail to do their job and that will be people like the traitor [Judge 1].”

The email allegedly sent on to say, “I will try my best not to harm the traitor [Judge 1], but like I said, [Judge 1] is a traitor and needs to be delt [sic] with.”

Kaetz faces charges of making a communication containing a threat to injure a person and threatening to assault and murder a federal judge. He faces up to 15 years in prison if convicted. Each charge also carries a maximum fine of $250,000.

In July, a disgruntled attorney shot and killed the son of a federal judge at her home and wounded her husband.