I'm curious as to what law, exactly, they would be breaking. Sabotage in the US code is defined mostly in terms of war material and damages done to physical "national defense" properties. Certainly an employee would be fired and sued by the company, but is deliberately changing a routing policy (and not something like a worm or virus that deletes or otherwise degrades hardware and software) a crime?
Proof of intent is a significant burden placed upon prosecution. If that can be overcome, there’s legal precedent for criminal conviction namely under the CFAA.
https://tadlaw.com/can-charged-crime-sabotaging-employers-co...
(5)(a)knowingly causes the transmission of a program, information, code, or command, and as a result of such conduct, intentionally causes damage without authorization, to a protected computer;