Well, this is merely a hobby interest to me, and it's a been a while since I read 'Dark Pools' but: it's less "using information" to front-run, and more "taking advantage of computational glitches" to jump the queue and get higher priority in the order book.

I have no idea if this is still an issue (doubt it), but it was in the early days of HFT. Anyway, I'm out of my element...'Dark Pools' is a decent read if you're into this stuff.