@General T. Winters (5 April, 2017, 5:55 PM UTC):
Well, me, personally:

I'd wait for a time where they have few members on. I could find this out by peeking in on their activity, either myself or someone else.

Then I'd test to see how many troops are there, and crush it with (Ideally) with less than 1% losses.

Then probably spam around a bit to make sure they'd never notice - Spam sectors with nukes, invades, and the chats.

I'll admit it's probably not the most honourable or prestigious way, but I'd certainly say it would be effective.

The best way to capture an emitter is with troops!

Best if using offensive type troops.