Re: Best way to kill workers from Nasty hive
As you said, move the hive/hives and put an box in the old location. Put an empty super on top with #8 hardware cloth between it and the hive body. After dark put duct tape over the entrance. Remove the lid and put dry ice in the super. The next morning, clean out the deep. This won't harm any comb you put into the hive body.
In response to the poster who said there is no reason to kill bees...... You haven't encountered the wrong hive yet. I don't live in an AHB area but I got covered up by 1000's of bees from one hive. They gone.
Edit to add: I didn't read through all the responses before I posted. Publix grocery stores sell dry ice, if you have one in the area.
The more I learn about bees, the less I know.