MLB warned clubs of using tech in sign-stealing before Astros err
MLB sign stealing: History of allegations before Astros, Red Sox scandal - Sports Illustrated
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Astros used electronic sign-stealing method during title-winning 2017 season, report says
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Astros accused of high-tech sign-stealing scheme during 2017 championship season
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Cheated: The Inside Story of the Astros Scandal and a Colorful History of Sign Stealing eBook : Martino, Andy: Kindle Store
MLB sign stealing: History of allegations before Astros, Red Sox scandal - Sports Illustrated