Stealing J. Edgar Hoover’s Secrets: One night in 1971, files were stolen from an F.B.I. office near Philadelphia. They proved that the bureau was spying on thousands of Americans. The case was unsolved, until now.

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PHILADELPHIA — The perfect crime is far easier to pull off when nobody is watching. So on a night nearly 43 years ago, while Muhammad Ali and Joe Frazier bludgeoned each other over 15 rounds in a televised title bout viewed by millions around the world, burglars took a lock pick and a crowbar and broke into a Federal Bureau of Investigation office in a suburb of Philadelphia, making off with nearly every document inside.

They were never caught, and the stolen documents that they mailed anonymously to newspaper reporters were the first trickle of what would become a flood of revelations about extensive spying and dirty-tricks operations by the F.B.I. against dissident groups.

The burglary in Media, Pa., on March 8, 1971, is a historical echo today, as disclosures by the former National Security Agency contractor Edward J. Snowden have cast another unflattering light on government spying and opened a national debate about the proper limits of government surveillance. The burglars had, until now, maintained a vow of silence about their roles in the operation. They were content in knowing that their actions had dealt the first significant blow to an institution that had amassed enormous power and prestige during J. Edgar Hoover’s lengthy tenure as director.

“When you talked to people outside the movement about what the F.B.I. was doing, nobody wanted to believe it,” said one of the burglars, Keith Forsyth, who is finally going public about his involvement. “There was only one way to convince people that it was true, and that was to get it in their handwriting.”

Mr. Forsyth, now 63, and other members of the group can no longer be prosecuted for what happened that night, and they agreed to be interviewed before the release this week of a book written by one of the first journalists to receive the stolen documents. The author, Betty Medsger, a former reporter for The Washington Post, spent years sifting through the F.B.I.’s voluminous case file on the episode and persuaded five of the eight men and women who participated in the break-in to end their silence.

Unlike Mr. Snowden, who downloaded hundreds of thousands of digital N.S.A. files onto computer hard drives, the Media burglars did their work the 20th-century way: they cased the F.B.I. office for months, wore gloves as they packed the papers into suitcases, and loaded the suitcases into getaway cars. When the operation was over, they dispersed. Some remained committed to antiwar causes, while others, like John and Bonnie Raines, decided that the risky burglary would be their final act of protest against the Vietnam War and other government actions before they moved on with their lives.

“We didn’t need attention, because we had done what needed to be done,” said Mr. Raines, 80, who had, with his wife, arranged for family members to raise the couple’s three children if they were sent to prison. “The ’60s were over. We didn’t have to hold on to what we did back then.”

A Meticulous Plan

The burglary was the idea of William C. Davidon, a professor of physics at Haverford College and a fixture of antiwar protests in Philadelphia, a city that by the early 1970s had become a white-hot center of the peace movement. Mr. Davidon was frustrated that years of organized demonstrations seemed to have had little impact.

In the summer of 1970, months after President Richard M. Nixon announced the United States’ invasion of Cambodia, Mr. Davidon began assembling a team from a group of activists whose commitment and discretion he had come to trust.

The group — originally nine, before one member dropped out — concluded that it would be too risky to try to break into the F.B.I. office in downtown Philadelphia, where security was tight. They soon settled on the bureau’s satellite office in Media, in an apartment building across the street from the county courthouse.

That decision carried its own risks: Nobody could be certain whether the satellite office would have any documents about the F.B.I.’s surveillance of war protesters, or whether a security alarm would trip as soon as the burglars opened the door.

The group spent months casing the building, driving past it at all times of the night and memorizing the routines of its residents.

“We knew when people came home from work, when their lights went out, when they went to bed, when they woke up in the morning,” said Mr. Raines, who was a professor of religion at Temple University at the time. “We were quite certain that we understood the nightly activities in and around that building.”

But it wasn’t until Ms. Raines got inside the office that the group grew confident that it did not have a security system. Weeks before the burglary, she visited the office posing as a Swarthmore College student researching job opportunities for women at the F.B.I.

The burglary itself went off largely without a hitch, except for when Mr. Forsyth, the designated lock-picker, had to break into a different entrance than planned when he discovered that the F.B.I. had installed a lock on the main door that he could not pick. He used a crowbar to break the second lock, a deadbolt above the doorknob.

After packing the documents into suitcases, the burglars piled into getaway cars and rendezvoused at a farmhouse to sort through what they had stolen. To their relief, they soon discovered that the bulk of it was hard evidence of the F.B.I.’s spying on political groups. Identifying themselves as the Citizens’ Commission to Investigate the F.B.I., the burglars sent select documents to several newspaper reporters. Two weeks after the burglary, Ms. Medsger wrote the first article based on the files, after the Nixon administration tried unsuccessfully to get The Post to return the documents.

Keith Forsyth, in the early 1970s, was the designated lock-picker among the eight burglars. When he found that he could not pick the lock on the front door of the F.B.I. office, he broke in through a side entrance.

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