Earlier quoted context omitted.
This would be an issue of national security. I would not want to be the person who spends money to set up drilling toward the Yellowstone Supervolcano without alerting the US Department of the Interior of the plans.
I can only imagine that such a massive enterprise would be entirely conducted by the US Government, probably any of the military branches(is Engineers Corps still a thing?)
I am sure that a minimum of the US Geological Survey and ACE will be involved in any supervolcano remediation plan. And probably FEMA but hopefully they won't need to act. ;)