VERY AGGRESSIVE dog, dont know what to do?

were going to go bring him in to our local humane society monday, but were scared hes gonna bite someone in the progress of getting him in, weve already had him aggressivly snarl at 4 people and ALMOST bit all of them this week. Sadly, my family were the ones that had to experience those horrid bites. We dont know what to do, im scared hes gonna bite someone on monday at the humane society when they try taking him, actually he probably will