(CNN) The FBI used techniques reminiscent of Cold-War spy tactics to eavesdrop on Russian intelligence agents in New York City: bugging binders full of "confidential" industry information, court documents revealed this week.
The covert practice was revealed in filings for the trial of Evgeny Buryakov on Tuesday, who was arrested in January 2015. Prosecutors allege that Buryakov's cover was as an employee for a Russian Bank in New York City but he actually was working for the Russian foreign intelligence agency, SVR.
Spying on their own countries
Several American turncoats have been caught spying on their own countries while working at the CIA, the National Security Agency, the US State Department and the Pentagon. Here's a quick look at who got caught and how they were punished.
After what looked like a successful 16 years in the CIA, Harold James "Jim" Nicholson was caught selling secrets to Russia. He was convicted on espionage charges in 1997 and sentenced to 23 years in prison. In 2011, Nicholson's son Nathaniel was charged after meeting with Russian agents to collect money owed to his father. He was sentenced to five years probation. As a result, Harold Nicholson was sentenced to an additional eight years in prison on charges of conspiracy to act as an agent of a foreign government and conspiracy to commit money laundering.
Retired US State Department analyst Walter Kendall Myers, left, pleaded guilty to wire fraud and conspiracy to commit espionage for Cuba in 2009. His wife, Gwendolyn Myers, right, pleaded guilty to conspiracy to gather and transmit national defense information. In 2010 Myers was sentenced to life in prison. His wife was sentenced to 81 months.
American citizen Ana Montes worked for the Pentagon intelligence arm, the Defense Intelligence Agency, for 16 years before she was caught spying for Cuba. In 2002, she pleaded guilty to espionage and was sentenced to 25 years in federal prison.
Aldrich Ames, a 31-year CIA employee, pleaded guilty to espionage charges in 1994 and was sentenced to life in prison. Ames was a CIA case worker who specialized in Soviet intelligence services and had been passing classified information to the KGB since 1985. US intelligence officials believe that information passed along by Ames led to the arrest and execution of Russian officials they had recruited to spy for them.
Jonathan Pollard is a divisive figure in US-Israeli relations. The former US Navy intelligence analyst was caught spying for Israel in 1985 and was sentenced in 1987 to life imprisonment. Previously, the United States and Israel discussed his possible release as part of efforts to save fragile Middle East peace negotiations, according to sources familiar with the talks. In 2015,
Pollard was released on parole -- 30 years after his arrest.
Robert Hanssen pleaded guilty to espionage charges in 2001 in return for the government not seeking the death penalty. Hanssen began spying for the Soviet Union in 1979, three years after going to work for the FBI, and prosecutors said he collected $1.4 million for the information he turned over to the Cold War enemy. In 1981, Hanssen's wife caught him with classified documents and convinced him to stop spying, but he started passing secrets to the Soviets again four years later. In 1991, he broke off relations with the KGB, but resumed his espionage career in 1999, this time with the Russian Intelligence Service. He was arrested after making a drop in a Virginia park in 2001.
John Walker ran a father and son spy ring, passing classified material to the Soviet Union from 1967 to 1985. He was a Navy communications specialist with financial difficulties when he walked into the Soviet Embassy and sold a piece of cyphering equipment. Navy and Defense officials said that Walker enabled the Soviet Union to unscramble military communications and pinpoint the location of US submarines at all times. As part of his plea deal, prosecutors promised leniency for Walker's son Michael Walker, a former Navy seaman. Michael Walker was released in 2000 after serving 15 years in prison. John Walker
died in prison in 2014.
Ronald Pelton joined the super-secret National Security Agency, the US government's electronic intelligence arm, after serving in the Air Force's communications intelligence division. He resigned in 1979, but after running into financial trouble, he approached the Soviet Embassy in Vienna. He then began passing Moscow classified information, including details of a program that tapped undersea Soviet communications cables. He was exposed when his handler defected to the United States in 1985. Although he was sentenced to three concurrent life sentences, Pelton eventually was released in 2015.
Earl Pitts' job was to monitor suspected Soviet spies at the United Nations. But the veteran FBI agent soon began selling his secrets to the KGB, which he contacted in 1987, and its successor agencies after the Soviet Union collapsed. He got about $224,000 from the Kremlin before a Russian double agent tipped off US intelligence, and he was arrested in 1996. The federal judge who sentenced him to 27 years in prison -- more than prosecutors had requested -- told him, "You betrayed your country, you betrayed your government, your fellow workers and all of us, really."
Buryakov unknowingly began meeting with an undercover FBI agent who he believed to be an energy company analyst in 2012, according to the court documents.
The undercover agent started to supply the binders to Buryakov in 2013, urging him to return them as soon as he was finished with them because they were sensitive and confidential, the court documents say.
Buryakov complied with this request, allowing the U.S. government to record hours of conversations among Russian intelligence agent between January and May 2013, the documents reveal.
The recordings "make clear" that the men "were operating as SVR officers by receiving taskings from Moscow, gathering responsive information and sending it back to SVR headquarters," the court documents say.
Two of the agents recorded were Victor Podobnyy and Igor Sporyshev, the documents say.
It's not like in the movies
Podobnyy and Sporyshev were suspects in the ring associated with Buryakov, but left the United States and had diplomatic immunity because they were working for the Russian government. Buryakov, however, was here as a private citizen, operating under what officials call "non-official cover."
The audio recordings caught moments in which some of the men were not impressed with their work for the intelligence agency, envisioning that it would be a bit more Hollywood, the court documents reveal.
Podobnyy thought the work "would be just slightly more down to earth than in the movies about James Bond," like using a false identity, the court documents say.
Why the alleged spy ring matters
Sporyshev agreed, saying that he thought he would travel abroad with a "different passport."
The recordings also suggest that this wasn't Buryakov's first stint as an intelligence officer, the prosecutors allege.
Podobnyy was recorded telling Sporyshev that Buryakov had been in South Africa under what the prosecutors say was "non-official cover between approximately 2004 and 2009."
Former Putin aide died of 'blunt force trauma'
Buryakov's lawyer did not immediately return CNN's request for comment Thursday.
He is due in Manhattan federal court on April 4.