Hi...
They didn't BAN automatic weapons as such...what 'they' did was have more thourough background checks on prospective owners...plus a $200.00 federal tax stamp to own one.
As an aside, the first time I toured the FBI HQ in DC, they delighted in showing off the potency of the Thompson Sub-Machine Gun. Of course, they only rarely carried them then, which was...at times...a deadly flaw of the Bureau, in MuHO.
The last time I was given a tour of their HQ, they delighted in showing off the potency of the M-16. Of course, they rarely carried them, which was...at times...a deadly flaw of the Bureau...!! Again, in MuHO.
The did...eventually...give their agents pistols to replace their revolvers. Even then, many Agents had .38 cal. revolvers as their back-up (ankle holster) gun.
sent from my iBrow