The assignment carried a lot of risk and not much reward.

The Long Island detective would try to shut down illegal gambling operations run out of backrooms in a shoe repair store, a cafe and a chess club. The work netted him around $8,000. But his employer wasn’t the police: It was the Bonanno crime family, which paid him to target the franchises of rival families.

On Wednesday, the risk was realized. A federal jury in Brooklyn found the former Nassau County detective, Hector Rosario, 51, guilty of lying to the authorities about his knowledge of the illegal gambling scheme. The jurors acquitted him on a charge of obstructing justice.

John J. Durham, the U.S. attorney for the Eastern District of New York, said in a statement that Mr. Rosario had eroded trust in law enforcement.

“This corrupt detective chose to prove his loyalty to an organized crime family over the public he was sworn to protect,” Mr. Durham said.

The Japanese Meteorological Agency on Saturday issued an emergency heavy rain warning, the highest level of alert,pinaswin88 login for Ishikawa Prefecture, which includes Noto Peninsula. Residents’ lives were in imminent danger, the agency warned, adding that there was a high chance that a disaster had already happened in some areas.

Mr. Rosario, who wore a blue suit and orange tie, did not change expression as the forewoman read the verdict. When asked for a comment after the trial, Mr. Rosario said only, “in the future.”

Mr. Rosario faces up to five years in prison when Judge Eric N. Vitaliano sentences him. Mr. Rosario, who remains out on bail, would have faced an additional 20 years had he been convicted of obstructing justice. A sentencing date has not yet been set.

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