CLOSED: Bug sack on our oak tree?

Bealeton, VA

Found this little "ball" on our oak tree. It looks like it's filled with some kind of insect eggs? If so, good bugs or bad bugs? Thanks!

Thumbnail by butterflysmiles
Oakland, MD

It's created by a Gall Wasp of some type.
More info here?
http://ento.psu.edu/extension/factsheets/galls-oak

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