Garden Pests and Diseases: Eeek, what's happening here? , 1 by Twincol

Twincol wrote:
I was working on my new landscaping this afternoon and after 1/2 inch of rain Friday night decided it was an opportunity to level out the clay/hardpan soil my worker pulled out of the fencepost holes several months ago. So I just used the flat shovel to break it up and pick it up on preparation for move to "storage."

Not sure if this photo will be clearly illustrative, but there are a huge number of what appear to be white eggs or nymphs in a cluster, with a huge number of ants running about. There is a piece of root adjacent to the nest. I just cut through the center of the next and really scared the ants.

What is this? Do I need to do something with/about it? What?

TIA, Linda