The details are contained in the organization's confidential "perversion files," a blacklist of alleged molesters, that the Scouts have used internally since 1919. Scouts' lawyers around the country have been fighting in court to keep the files from public view.
As the L.A. Times reported last month, the blacklist often didn't work: Men expelled for alleged abuses slipped back into the program, only to be accused of molesting again. Now, a more extensive review has shown that Scouts sometimes abetted molesters by keeping allegations under wraps.
In the majority of cases, the Scouts learned of alleged abuse after it had been reported to authorities. But in more than 500 instances, the Scouts learned about it from victims, parents, staff members, or anonymous tips.
In about 400 of those cases - 80 percent - there is no record of Scouting officials' reporting the allegations to police. In more than 100 of the cases, officials actively sought to conceal the alleged abuse or allowed the suspects to hide it, the newspaper found.
In 1976, five Boy Scouts wrote detailed complaints accusing a Pennsylvania scoutmaster of two rapes and other sex crimes, according to his file. He abruptly resigned in writing, saying he had to travel more for work.
"Good luck to you in your new position," a top troop representative wrote back. He said he was accepting the resignation "with extreme regret."
In 1982, a Michigan Boy Scout camp director who learned of allegations of repeated abuse by a staff member told police he didn't promptly report them because his bosses wanted to protect the reputation of the Scouts and the accused staff member.
"He stated that he had been advised by his supervisors and legal counsel that he should neutralize the situation and keep it quiet," according to a police report in the file.
Scouting officials declined to be interviewed for this article. In a prepared statement, spokesman Deron Smith said, "We have always cooperated fully with any request from law enforcement and today require our members to report even suspicion of abuse directly to their local authorities."
The group instituted that requirement in 2010. Before then, the policy was to obey state laws, which didn't always require groups to report abuse.
In some instances, however, the Scouts may have violated state laws. Since the early 1970s, for example, New Jersey has required anyone who suspects child abuse to report it. In several cases there, the Scouts had firsthand reports of alleged abuses, but nothing in the files indicates they informed authorities.