"..the Astros stole catchers’ signs by picking them up on a television feed and relaying them to batters by banging on a trash can, ..."

"- The nine-page commissioner's report details how the Astros stole catchers' signs throughout the 2017 season by picking them up on a television feed and relaying them to batters by banging on a trash can, confirming an earlier admission by former Astros pitcher Mike Fiers to the Athletic..."

https://www.latimes.com/sports/dodgers/story/2020-01-13/column-astros-should-vacate-2017-world-series-title-dodgers-still-feel-empty