Almost 150 yrs. ago, President Lincoln found it necessary to hire a private investigator-Mr. Alan Pinkerton. He was actually the beginning of the Secret Service.
Since that time federal police authority has grown to a large number of lettered agencies-FBI, CIA, INS, IRS, DEA, BATF, SS, ATF, etc.
Now comes the “Federal Air Transportation Airport Security Service.”
Can’t you see it now, the new service in their black outfits with their initials in large white letters across their backs?
FATASS.