In fact, the report found, Mr. Halloran had no evidence for his accusation, and his account of conversations with two workers differed sharply from what the workers told investigators.
"In toto," the report said, "Mr. Halloran's information about city employee statements contributed no actual evidence about a possible slowdown."
H/t to Oliver Willis, who summarizes:
It's almost as if conservatives, Republicans, and the conservative media pushed a fraudulent story simply to kick unions in the balls as part of the decades-long attempt to bust unions and screw over working-class people. Wait, that's exactly what happened.