WASHINGTON — The FBI gave its informants permission to break the law at least 5,658 times in a single year, according to newly disclosed documents that show just how often the nation’s top law enforcement agency enlists criminals to help it battle crime.

The U.S. Justice Department ordered the FBI to begin tracking crimes by its informants more than a decade ago, after the agency admitted that its agents had allowed Boston mobster James “Whitey” Bulger to operate a brutal crime ring in exchange for information about the Mafia. The FBI submits that tally to top Justice Department officials each year, but has never before made it public.

Agents authorized 15 crimes a day, on average, including everything from buying and selling illegal drugs to bribing government officials and plotting robberies. FBI officials have said in the past that permitting their informants — who are often criminals themselves — to break the law is an indispensable, if sometimes distasteful, part of investigating criminal organizations.

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