Judges Targeted Fast Facts

WASHINGTON, DC - APRIL 10:  Principal Deputy Solicitor General of the United States Srikanth Srinivasan is sworn in before testifying to the Senate Judiciary Committee on Capitol Hill April 10, 2013 in Washington, DC. U.S. President Barack Obama has nominated Sirnivasan to be circuit judge for the United States Court of Appeals for the District of Columbia Circuit. A significant number of Supreme Court appointees were previously D.C. Circuit Court judges.  (Photo by Chip Somodevilla/Getty Images)

(CNN)Here's a look at what you need to know about cases where U.S. judges have been targets of violence. Three federal judges were targeted and murdered from 1979 to present: Judge John Wood, Judge Richard Daronco and Judge Robert Vance.

U.S. Marshals Service:
The U.S. Marshals Service is in charge of protecting federal judges.
The Marshals Service protects approximately 2,200 federal judges and approximately 26,000 other court officials at more than 400 court facilities throughout the nation. (U.S. Marshals Service)
    2015 - 826 threats and inappropriate communications against the judiciary assessed, mitigated and deterred by the Marshals.
    2014 - 768 threats and inappropriate communications against the judiciary assessed, mitigated and deterred by the Marshals.
    2013 - 1,155 threats and inappropriate communications against the judiciary assessed, mitigated and deterred by the Marshals.
    2012 - 1,370 threats and inappropriate communications against the judiciary assessed, mitigated and deterred by the Marshals.
    Timeline:
    June 3, 1974 -
    Washington state Superior Court Judge James Lawless is killed by a mail bomb in his chambers. Ricky Anthony Young is convicted of the crime.
    May 29, 1979 - U.S. District Judge John Wood is killed by a contract killer allegedly tied to a drug-smuggling case the judge is handling. Three members of the Chagra family are later convicted of conspiring to kill Judge Wood. One of the Chagras had been scheduled to appear before Judge Wood in the drug smuggling case.
    1983 - Illinois Judge Henry Gentile is shot and killed in his courtroom by a man whose divorce case is being handled by Judge Gentile. The man had hidden the gun used in a blanket in his wheelchair.
    March 20, 1987 - Joel Cacace, of the Columbo crime family, hires hitmen to kill federal prosecutor William Aronwald. By mistake they tail Aronwald's father, George, a 78-year-old city administrative law judge who shares an office with his son. They kill Aronwald when he stops to pick up his laundry.
    September 14, 1987 - Mississippi Circuit Judge Vincent Sherry and his wife Margaret are killed in their home. The murders are tied to a prison scam run by former Biloxi Mayor Pete Halat who shared a law office with Sherry. Prosecutors say Halat believed the Sherrys may have taken some of the scam profits for themselves.
    May 21, 1988 - U.S. District Judge Richard Daronco is shot and killed at his home in Pelham, New York, by a man upset over Daronco's dismissal of the man's daughter's sexual discrimination suit.
    1989 - Federal Appeals Court Judge Robert Vance is killed in his home in Birmingham, Alabama when he opens a mail bomb. Walter Leroy Moody Jr. is convicted of the death of Vance and attorney Robert Robinson. Prosecutors allege Moody sent the mail bombs out of anger over his conviction in 1972 for possessing a mail bomb.
    March 18, 1999 - Los Angeles County Court Commissioner H. George Taylor and his wife Lynda are shot and killed at their home in Rancho Cucamonga. Investigators believe the shootings are "court-related" but the case remains unsolved.
    February 28, 2005 - The husband and mother of U.S. District Court Judge Joan Humphrey Lefkow are shot to death inside the Lefkow's Chicago home. A former plaintiff whose case had been dismissed by Judge Lefkow claims credit for the murder in a suicide note.