http://en.wikipedia.org/wiki/Federal_law_enforcement_in_the_United_States
I figure that the best could be a reduction to perhaps 20-30, because there are some legitimate police functions.
Each of the military branches has their own police, Customs and Border Patrol, US Marshals, FBI, Secret Service, US Postal Inspector, Park Rangers, Federal Protective Service (federal buildings security), National Institute of Health (Public Health Service), Bureau of Indian Affairs Police, Federal Bureau of Prisons, Diplomatic Security, Bureau of Engraving and Printing & US Mint police, Judicial Branch police, and Nuclear Regulatory Commission police.
Many of the reductions would still have useful functions, but would be rolled into other police agencies. Others are not “public” agencies, so only police their particular agency. For example, each of the 16 Intelligence agencies has their own internal police, mostly for policing themselves up.
Delegislate obamacare and close the IRS. And if it can be done on little barry bastard boy’s watch, so much the better.