The Houston Astros have been egregiously stealing signs for the past three seasons, and the is proof being published all over the internet.
There has been footage shown of the (not so) elaborate setup in the Astros clubhouse in which a team employee or player would watch a screen and monitor it until they cracked the opposing team’s sign and then they’d proceed to go full Carlos Gomez on a inconspicuously placed trash can. Pummeling the poor bin loud enough for the noise to be heard at the plate, as well as through the audio of the broadcast.