Answer
The Pistons earned the nickname "Bad Boys" during the era of Isiah Thomas due to their aggressive and physical style of play. Led by Thomas, Bill Laimbeer, and Dennis Rodman, the Pistons were known for their hard fouls and intimidating defense. They often pushed the boundaries of what was considered acceptable in the NBA, but their toughness and determination helped them win two NBA championships in 1989 and 1990.