Move the whole hive more than 20 yards away. More's better. Then you can work the hive with a lot less angry bees around, that's assuming they are not africanised. You can put a weak hive there a couple of hours later to get boosted by the returning bees. Check the aggressive hive to see if there are eggs and young larvae. If so, there is a queen. You then have to either find and kill it, or kill the whole hive. If you just put them in a plastic bag they will suffocate. Don't leave it in the sun your combs might melt. If there is no queen or you find and kill it, just make sure there are no queen cells then unite the whole thing with a weak hive, come back & ask if you are going to do this so you can get good instructions to make sure it's done right & they don't kill the other queen.