Disgraced cyclist Lance Armstrong has not only spent years vehemently denying using banned performance-enhancing drugs; he also has viciously attacked those who told what they knew about doping in the sport and implicated him in the process.

In what could now be seen as supreme hypocrisy -- or a new definition of "chutzpah" -- Armstrong even sued agencies that accused him of doping -- in some cases accusing those agencies of libel.

Here is a look back at a dozen quotes that highlight how far -- or, some say, how low -- Armstrong has been willing to go.

Attacks

"Desperate for attention and money"

Fellow cyclist Floyd Landis was stripped of his 2006 Tour de France title after testing positive for synthetic testosterone. He ultimately came forward and spoke about other cyclists, saying he wanted to "clear my conscience."

"Armstrong and his camp hit back swiftly, forcefully and with a smooth coordination that comes from years of practice," Sports Illustrated reported.

Last year, in a lawsuit calling for the U.S. Anti-Doping Agency to drop charges against Armstrong, Armstrong's attorneys described Landis as "desperate for attention and money." Landis was acting against Armstrong "with his cycling career, finances, and personal life in shambles," the attorneys argued.

There has long been no love lost between the two men. Sports Illustrated reported in 2010 that Landis predicted Armstrong "is going to jail."

"I'm going to make your life a living... f---ing ... hell," Armstrong allegedly said

Another former fellow cyclist-turned-enemy, Tyler Hamilton, cooperated with federal authorities and testified about Armstrong. He also spoke with CBS' "60 Minutes." Soon after, Armstrong and Hamilton bumped into each other at a restaurant in Aspen, Colo.

Precisely what happened is disputed. Hamilton said that as he was leaving the bathroom, Armstrong blocked his path. "He wanted to get into it," Hamilton later told Outside Online.

A USADA report in October contains quotes from Hamilton's testimony, including an allegation that Armstrong, at the restaurant, said to him, "I'm going to make your life a living... f---ing ... hell."

Armstrong has said he asked Hamilton "what's up" and that the encounter "was certainly awkward for both of us. It was truly uneventful."

"Obsession" with "getting" me

Armstrong has accused Travis Tygart, head of USADA of carrying out an "unconstitutional witch hunt."

The lawsuit Armstrong's camp filed last year against USADA named Tygart personally as a defendant, saying he had "a well-publicized obsession with 'getting' Mr. Armstrong. Defendant Tygart evidently believes that USADA needs to bring a big case against a 'big fish' to justify its existence."

In a recent interview with CBS' "60 Minutes," Tygart alleged Armstrong was personally involved in intimidating other riders into keeping quiet about doping.

Tygart also said he personally received anonymous threats. He did not say those threats came from Armstrong. They came as e-mails and letters, Tygart said. The worst was a threat to put "a bullet in my head."

"You know enough to bring me down," Armstrong allegedly told masseuse

Another player in the drama that led to Armstrong's downfall is Emma O'Reilly, who was once a masseuse and personal assistant to Armstrong and his cycling team.

She spoke out in a 2003 book "L.A. Confidentiel," published in French and subsequently translated into English, and later spoke to USADA for its investigation.

She said she was in the room when Armstrong and two other team officials came up with a plan to backdate a prescription for corticosteroids to explain a positive steroid test result during the 1999 Tour de France.

"Now, Emma, you know enough to bring me down," she says Armstrong told her after that meeting.

She also said she took clandestine trips to pick up and drop off what she assumed were doping products, and that she bought Armstrong makeup to help conceal a bruise from a syringe injection. But she said she did not personally see Armstrong use banned substances.

O'Reilly has said Armstrong trashed her after she spoke out publicly.

There are far more cases of Armstrong lashing out against those who crossed his path, such as journalist David Walsh, author of "L.A. Confidentiel -- Les Secrets de Lance Armstrong."

But let's turn to some of the former cycling legend's past claims about his record and where the alleged "witch hunt" came from.

"He's trying to back up his old lady."

Among those who crossed Armstrong's path was fellow cyclist Frankie Andreu. He and his wife, Betsy, were once among Armstrong's closest friends. The two say they were with Armstrong when he told a doctor he had taken performance-enhancing substances, including EPO, testosterone, cortisone, growth hormone and steroids. The Andreus testified about the incident under oath.