system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What would the Rebellion do with a Star Destroyer that had defected?

Suppose that after the destruction of Alderaan, a good chunk of the crew of a Star Destroyer decides that the Empire has gone too far and decides to defect. The top command staff and a bit more than a skeleton crew sized chunk of the crew manage to get all the loyalists off ship and they show up at a Rebellion base, with most of their war materiel intact, eager to join. What would the Rebellion do?
gpt
They would appropriate it, naturally. This is not unheard of by the way both in new or old canons. In new canon it's been said that quite a bit of imperial fleet had surrendered after Endor. In old canon most of the fleet had fractured between various warlords, but Rogue Squadron... arkem, "*persuaded*" some of the imperial captains to defect. One of those Star Destroyers ended up in hands of infamous smuggler Booster Terric, and was rechristened as Errant Venture. For the longest time it was the largest warship ever in private hands. 

Other star destroyers were simply included in Rebel - or by that point New Republic - fleet.