RE: the "government worker" with the poor command of English.
Most of these are announcements that you have been awarded a government grant of several thousand dollars, out of the blue, for some not-exactly-plausible reason like you pay your taxes on time.
They just need either your banking information or a credit card to take care of the "processing fee." Some people have been scammed out of several processing fees, in the usual 419 scam fashion.
Sometimes, instead of the fee, they ask for the banking details so they can do direct deposit of all that swell money. Of course, it will be a direct withdrawal instead.
Some are pretty sophisticated, spoofing a Washington DC area code for caller ID and referring you to fake web sites they have set up.