Notorious Hollywood satanist Anton LaVey was once embroiled in a plot to assassinate Senator Ted Kennedy during the 1980 presidential campaign.

An informant had claimed that LaVey, who was the founder of the Church of Satan, had told him in October 1980 that he was planning to murder the third Kennedy brother.

The bizarre allegations, which were not publicly known, were included in documents related to the FBI investigation that were only recently uncovered by Politico in the bureau's online Vault library.

LaVey, a flamboyant and Hollywood-esque character, founded the Church of Satan in 1966.

The church was run from a building in San Francisco that became known as Satan House or the Black House where LaVey would perform satanic rituals and seminars - often surrounded by groups of naked women.

Notorious Hollywood satanist Anton LaVey was once embroiled in a plot to assassinate Senator Ted Kennedy during the 1980 presidential campaign

He had no prior arrest history but was linked to actress Jayne Mansfield prior to her tragic death in the late 1960s. LaVey was rumored to have had an affair with the actress and they were pictured together at his Black Church

According to the FBI report, the informant contacted investigators from Chicago on October 20 to say he had received a phone call from LaVey.

What followed was a two-week investigation by the FBI and Secret Service at the time Kennedy was helping Jimmy Carter campaign for the election.

Just prior, Kennedy had initially decided to run against Carter but lost the Democratic nomination.

The informant told investigators that LaVey, who called himself the Black Pope, had called him and said he owed him a favor.

LaVey allegedly told the informant he would receive a package within days that he wanted him to deliver to a mob boss in Chicago's South Side.

The mob would then kill Kennedy, the informant told the FBI.

The informant told investigators he received a visit from a Church of Satan member who specifically discussed the cult and the plot against the Senator.

He told the FBI that LaVey had planned to fly to Chicago on October 27 with eight kilos of hashish and cash.

The FBI documents say agents followed up on the tip but LaVey never arrived at Chicago's O'Hare Airport on that day.

LaVey, a flamboyant and Hollywood-esque character, founded the Church of Satan in 1966. The church was run from a building in San Francisco that became known as Satan House or the Black House where LaVey would perform satanic rituals and seminars

An informant had claimed that LaVey, who was the founder of the Church of Satan, had told him in October 1980 that he was planning to murder the third Kennedy brother while he was helping Jimmy Carter (pictured above together) campaign for the election

The investigators made their way back to LaVey's Black House to speak with him but were told he wasn't there.

They returned two days later and interviewed LaVey.

According to the documents, LaVey denied having anything to do with the assassination plot.

He said he had 'the highest regards for Senator Kennedy and his family', according to the records.

LaVey had received several phone calls from the Chicago area on October 23 and 27 but that he didn't know the person's identity and that he hadn't returned the call.

The FBI turned their attention back to the informant given the inconsistencies in his account.

The Secret Service had earlier conducted a polygraph on the informant but the results came back inconclusive due to cocaine use.

In the decade after founding the church, LaVey cut back on his public performances and focused writing books about satanism

The church was run from a building in San Francisco that became known as Satan House or the Black House where LaVey would perform satanic rituals and seminars - often surrounded by groups of naked women

The informant was never charged with a crime regarding the information he provided in relation to the so-called Kennedy plot.

There are also no details in the FBI investigation that detail the informant's reasoning for mentioning LaVey.

It is not clear if Kennedy ever knew of the investigation into the assassination plot.

In the decade after founding the church, LaVey cut back on his public performances and focused writing books about satanism.

He had no prior arrest history but was linked to actress Jayne Mansfield prior to her tragic death in the late 1960s.

LaVey was rumored to have had an affair with the actress and they were pictured together at his Black Church.

There were rumors that LaVey put a hex on Mansfield's boyfriend Sam Brody saying that he would be killed in a car wreck.

Brody and Mansfield were both killed in a crash in 1967 near New Orleans.

LaVey, who continued to live at the Black Church in San Francisco even after it closed down, died in 1997 of pulmonary edema at the age of 67.