It's a dying Porites asteroides, with some attached Halimeda sp. as mentioned above. Collecting this coral in the Bahamas was illegal. Smuggling it into the U.S. was illegal. Both carry stiff penalties (fines on the order of tens of thousands of dollars, and possible jail time).
Illegally collecting and smuggling in this coral was an incredibly bad idea, if only from a legal perspective. You're very lucky you're safe at home right now, and not in custody (here or in the Bahamas). I've seen people get busted by Fisheries and Wildlife after posting information like this on the internet though. It may be worthwhile to contact FWS with a 'hypothetical' situation wherein someone collected a coral illegally on vacation and brought it into the U.S. and ask their advice about the best course of action for that person. Perhaps sacrificing the specimen voluntarily would keep them from taking legal action??? I have no idea, but I would suggest finding out what the best options for you are.
As for everyone else I would just say, beware. Illegally collecting and transporting corals (or any wildlife) can be financially devastating, and maybe even land you jail time. It's definitely not worth it.
Chris
p.s. The coral SHOULD have been left in the Bahamas. Saying so isn't rude, it's prudent, and I for one am not going to STFU about it.