Report: MLB confirmed whistling after Yankees complained in ALCS, unsure if Astros were source

Yankees think Astros are stealing signs by whistling - NBC Sports

MLB: Astros weren't whistling to relay stolen Yankees signs in ALCS, report says

ALCS: Justin Verlander Dominates for Astros in Win Over Yankees - The New York Times

Yankees swept by Astros in ALCS as costly error dooms Game 4

Yankees swept by Astros in ALCS as costly error dooms Game 4

Astros, Yankees address whistling, pitch-tipping

Like Carlos Beltran, fellow Yankees alum Cameron Maybin perhaps was a big cheater on 2017 Astros, fan investigation shows

Is this the Astros whistling the Yankees complained about in playoffs?

Houston Astros cleared of wrongdoing in 2020: MLB explored wearable devices during the investigation but found no evidence to substantiate it