John Patsalos (Greek: Γιάννης Πάτσαλος, born January 6, 1938), formerly known as John Patler, is an American former Nazi who was convicted of the August 25, 1967, murder of American Nazi Party (ANP) leader George Lincoln Rockwell.

Both brothers spent two weeks at the Youth House while their father faced child abuse charges, but were later released back into his custody.

Patsalos served in the U.S. Marine Corps from 1958 to 1960, when he was honorably discharged on grounds of "unsuitability" after being arrested at an American Nazi Party rally.

[2][3] He joined the American Nazi Party in 1960 and changed his surname to "Patler" to make it sound more like "Hitler".

On May 24, 1961, Patler, Rockwell, and eight others were arrested on charges of disturbing the peace in New Orleans after trying to picket the movie Exodus.

In 1963, Patler was arrested and convicted of disorderly conduct for picketing an integration rally in New Jersey.

Patler was sentenced to 20 years in prison by Arlington Circuit Court Judge Charles Russell.

In 1969, he won a $15,000 libel ruling against an American Nazi Party official who had told the FBI Patler had stolen the gun used to kill Rockwell.

[18][13] In 1970, Patsalos was reported as using his old name again, and as contributing to a Spanish language newspaper called El Pueblo, with him condemning racism in an editorial.

[12] In a 1970 article, Patsalos said, "I think [members of the National Socialist White People's Party are] always watching me ... so I never go any place without looking behind me", along with claiming "I think one of them may be the guy who really killed Rockwell".

[28] In a 2012 book, Nicholas, the son of Patsalos, recalled his father expressing regret for his time in the American Nazi Party, with him saying "I should have been with Dr. King and the Civil Rights people back then.