There is a big difference between "bees" and hornets & wasps.
Bees typically refers to honeybees, leave them alone if possible. If they're in a tree that must be removed, contact a local beekeeper and ask them if they're interested in messing with them. Some beekeepers may be willing to come out and take a look. If you can't find anybody to take the bees then killing them would be acceptable (as a last resort). Mix up some soapy water in a normal hand-held sprayer and spray them liberally. If you're careful in your spraying, you may be able to salvage some of the capped honey and enjoy it.