Update: Social Security Administration, Another Federal Police

Intended to re-assure nervous citizens, the SSA intoned: “These investigators have full law enforcement authority, including executing search warrants and making arrests. Our investigators are similar to your State or local police officers." Except, of course, they are not. The SSA is building up a new Federal police force in addition to the FBI, DHS, ICE, ATF, and sundry other agencies. What are the checks upon this coercive force? How are the liberties of the people protected?