Punishing GMs and managers could be the difference in MLB’s foreign substance cleanupLeague sources believe that threat of punishment will inspire GMs and presidents to make sure their organizations comply6/15/2021, 9:52 PMAndy MartinoMLB InsiderMLB commissioner Rob Manfred looks on before game two of the 2019 World Series between the Houston Astros and the Washington Nationals / © Troy Taormina-USA TODAY Sports