-> Believing that the Astros’ network had been compromised by a rogue hacker, Major League Baseball notified the F.B.I., and the authorities in Houston opened an investigation. Agents soon found that the Astros’ network had been entered from a computer at a home that some Cardinals officials had lived in. The agents then turned their attention to the team’s front office.
So it looks like the Astros/MLB were unable to determine internally how their network was compromised and then contacted the FBI. This seems perfectly reasonable to me.
I like that aspect, which is using the FBI's resources to help solve a problem. But, to me, it's fucked up that once you call the FBI, they take over, and often bring absurdly punitive charges with them. We saw this with Aaron Schwartz and Sergey Aleynikov.
So it looks like the Astros/MLB were unable to determine internally how their network was compromised and then contacted the FBI. This seems perfectly reasonable to me.