I have a hive that is the product of a swarm, I had thought that it was queenless because it was so angry and aggressive when I would inspect it. I went through it the other day and there is brood and they are pulling comb and making stores.

Why are they so mean?

I have a nuc and am thinking about shaking all the frames from the "mean" hive and putting them in with the new nuc.

What would this accomplish?

Thanks in advance for any and all help.