This is rough draft of a new element in corporate/alliance warfare. Where a single person can bring down a major alliance.
Role of the saboteur would be to make his way into the target corp and involve himself in the build process of ships and equipment. The saboteur would provide his new corp mates with especially modified ships and items that will malfunction whenever the Saboteur decides to reveal himself. So for example if there is a big fleet engagement going on between two alliances. In the middle of the fight, the saboteur would apply to join the corp he is loyal to, and as soon as he leaves his current corp he will put offline all the ships and equipment that originated from him.
It would be quite devastating if any of the directors or CEO's or even builders of the alliance suddently changed sides.
Special modified items will have to be part of contraband stuff. Simply because in order to build yourself such a powerful position in an alliance, you would have to do some smuggling and alot of preparation. Being a secret Saboteur will not be a easy careeer to maintain.
If you like the idea of big powerful alliances being vaulnerable to having their members bribed to switch sides, then feel free to give a thumbs up