Ted S. Warren/Associated Press
The Houston Astros' sign-stealing scandal first became public knowledge when pitcher Mike Fiers was among those who revealed the practice when speaking to Ken Rosenthal and Evan Drellich of The Athletic in November.
However, Fiers' current team, the Oakland Athletics, filed a complaint about Houston to Major League Baseball prior to the story going public.
Manager Bob Melvin and general manager David Frost both told Susan Slusser of the San Francisco Chronicle (h/t ESPN.com) the team did as much, but the former admitted it was hard for the league to do anything at the time.