The "spooky action" is really just the determination of a particle's spin on one side meaning you already know the other particle will have an opposite spin. This probably violates locality because you gain knowledge about something that's non-local from a quantum perspective, even though entangled particles have to start local (there are opposing interpretations, like the de Broglie-Bohm). While in fiction this might suggest that changing the state of one particle simultaneously changes the other, in real life this just means extra information you mathematically shouldn't have, and doesn't really lead to FTL information transmission. What it does mean is that if you want secure communications you can use entangled particles to generate a secret key, determining the spin of them on either side, and you can be sure that they haven't been tampered with and that the other side of the communication will be equal and opposite. It's essentially a one-time pad.