It's a hornet's nest. This time of the year should be no problem getting it. Judging by the pictures, you would not be able to smoke it out & shoot it down. I recently seen one in an antique store, it was priced at $50.
I have 2 huge nests hanging in my house, 1 found by hubby when he was a teenager...40+ years ago & preserved by his mother using clear spray lacquer. The 2nd (bigger) was found by my son about 10 years ago, it too is preserved. The whole branches are still attached to it. They both hang from the ceiling in the corner of brick wall (woodheater) surrounded by antique farm tools.