A league investigation confirmed the Astros had cheated by using a camera-based sign-stealing system during the regular season and playoffs of their World Series-winning 2017 season.
The WaPo said:
“The Houston Astros on Monday fired manager A.J. Hinch and general manager Jeff Luhnow, an hour after Major League Baseball suspended both for a year for their roles in an extensive sign-stealing scheme — a swift and powerful downfall for the duo that turned the Astros into the most ruthlessly efficient winning machine in baseball, producing a World Series title in 2017 that is now tainted.”