Not sure it will be possible to ever get rid of all commies. Here are a few ways you can take away their power:
Closing all federal agencies including but not limited to CIA, FBI, DHS, FDA, IRS, federal reserve, DOE, etc. Give all the employees a severance package contingent on them not seeking employment elsewhere.
Eliminating all subsidies and tax breaks to universities. Eliminate all federal grants for scientific research.
Eliminating public education, deregulating homeschooling and private schools.
This would be a good place to start.