Question: Who destroyed the "smoking gun" tape?
About the article "Watergate scandal", section "Resignation".

Candidate passages:
Continuing from the previous episode, "The Blessing Way", Dana Scully (Gillian Anderson) and Walter Skinner (Mitch Pileggi) hold each other at gunpoint.
Fox Mulder (David Duchovny), the person lingering outside his apartment, bursts in and forces Skinner to put his gun down.
He also demands that Skinner surrender the digital tape.
Skinner insists on keeping the tape, saying it is their only leverage in exposing the conspiracy.
The agents visit The Lone Gunmen, showing them an old photo featuring Bill Mulder, The Smoking Man, Deep Throat, and other members of the Syndicate.
The Lone Gunmen also recognize Victor Klemper, a notorious Nazi scientist who was brought to the United States under Operation Paperclip.
Melvin Frohike informs Scully of her sister Melissa's condition.
Mulder persuades Scully not to visit Melissa at the hospital, since she could be targeted there.
Furious that the wrong person was murdered, the Syndicate demands that the Smoking Man produce the tape.
The Smoking Man promises to do so the following day.
Meanwhile, Mulder and Scully visit Klemper, who says that the photo was taken at a former mining facility in West Virginia.
After the agents leave, Klemper calls the Well-Manicured Man and informs him that Mulder is alive.
The news causes the Syndicate to further mistrust the Smoking Man.
Meanwhile, at the hospital, Albert Hosteen visits Melissa while a suited man loiters nearby.
Mulder and Scully arrive at the mining facility and, using the code for Napier's constant given to them by Klemper, unlock one of the reinforced doors inside.
The agents discover a large complex of filing cabinets containing smallpox vaccination records and tissue samples.
Mulder finds his sister's file and finds that it was originally meant for him.
Meanwhile, Skinner tells the Smoking Man that he may have found the digital tape.
The Smoking Man is agitated at this, insisting that he will not make a deal with Skinner and tacitly threatening his life.
Hearing noise, Mulder heads outside and witnesses a UFO flying overhead; inside, small beings run past Scully.
Cars full of armed soldiers arrive, forcing the agents to flee.
The agents meet with Skinner at a diner in rural Maryland.
Skinner wants to turn over the tape in exchange for their reinstatement and safety.
After initially objecting, Mulder agrees to let Skinner turn the tape over.
Skinner heads to see Melissa in the hospital and is told by Albert of the mysterious blue-suited man outside.
Skinner chases the man to a stairwell where he is attacked by Alex Krycek and Luis Cardinal, who beat him unconscious and steal the tape.
Krycek narrowly escapes an attempt on his life when his car explodes.
He subsequently phones the Smoking Man, telling him that he has the tape and will make its contents public should anyone come after him.
The Smoking Man lies to the rest of the Syndicate, telling them that Scully's would-be assassin was killed in the car bombing and that the tape has been destroyed with him.
Mulder and Scully return to Klemper's greenhouse, finding the Well Manicured Man there.
He admits to knowing Mulder's father and states that he helped gather genetic data for post-apocalyptic identification, data Klemper used to work on alien-human hybrids.
Samantha was taken to ensure Bill Mulder's silence after he learned of the experiments.
Mulder confronts his mother, who tells him that his father chose that Samantha be taken.
At FBI headquarters, Skinner once again meets with the Smoking Man about the tape.
The Smoking Man calls Skinner's bluff, knowing he no longer has the tape, but Skinner reveals that Albert and twenty other Navajo have memorized the contents of the tape and are ready to reveal it if either Mulder or Scully are harmed.
Mulder meets with Scully at the hospital, who reveals that her sister died a few hours before.
Mulder tells Scully that he believes that the truth is still in the X-Files.
Scully tells him that she's heard the truth, and now what she wants are the answers. 
  "Smoking Gun"  
The phrase originated in the Sherlock Holmes story, "The Gloria Scott" (1893).
The origin and development of "smoking gun" was described by William Safire in his column, "On Language," as follows:It was made famous during the Golden Age of Political Coinage.
The Watergate era coined or popularized Saturday night massacre, stonewalling, cover-up, dirty tricks, straight arrow, expletive deleted, third-rate burglary, plumbers, Deep Throat, Big Enchilada, enemies list and twisting slowly in the wind.
That was when Doyle's smoking pistol, which had changed in occasional usage over 80 years to smoking gun, blazed its way into dictionaries.
It first appeared in The New York Times on July 14, 1974, in an article by Roger Wilkins: "The big question asked over the last few weeks in and around the House Judiciary Committee's hearing room by committee members who were uncertain about how they felt about impeachment was 'Where's the smoking gun?
The question was rooted in a Nixon defense strategy, to narrow the grounds for impeachment to a provable crime.
On July 31, Representative Jack Brooks of Texas told the impeachment panel that he thought Nixon was guilty of income-tax evasion: "Millions of Americans will view this evidence as a so-called smoking gun."
With insufficient proof, that charge did not stick.
On Aug. 5, the committee released a transcript of a recording of the meeting held two years earlier, on June 23, 1972, in which the White House chief of staff, H.R.
Haldeman, asked President Nixon, "You think the thing to do is to get them, the F.B.I., to stop?"
and Nixon replied, "Right, fine."
Representative Barber Conable of New York promptly said that "looked like a smoking gun," and the recording became known as "the smoking-gun tape."
  "Smoking Gun" (song), a 1986 #22 Billboard hit for Robert Cray  "Smoking Gun" (album), a 2009 #45 Austrian hit album for Angus Stone operating under the name Lady of the Sunshine  
Tape Wrangler is a duct tape dispenser produced by Stexley-Brake, LLC.
The tape gun is designed to dispense straight and smooth pieces of tape, working in the same way as tape dispensers do for pressure-sensitive tape.
The product was launched in 2008.