...in the ‘80s, put in by Tony LaRussa, as per Jack McDowell. Unfortunately, if this is true, the Sox did not get much return on their investment.
https://www.espn.com/mlb/story/_/id...-russa-had-sign-stealing-system-white-sox-80s
https://www.espn.com/mlb/story/_/id...-russa-had-sign-stealing-system-white-sox-80s