I was called on my home phone and informed I am one of the Top winner on the sweepstake and the next step is to get the "green card" from Walmart and will be instructed on procedure. I felt this is a beginning of a SCAM

This is a phone scam. They represent themselves as Publisher's Clearing House claiming you won millions, but need to come up with several hundred on a prepaid debit card for taxes. DO NOT give them any information or money. Simply advise them you are reporting the call to the police.

Yep - you are right.  They are scums!

2 person team.  Has a voice changer.  Located in Seattle.

This is a scam. The claim they are from sweepstakes international. I won 3.5 million anguillan dollars I have to pay $599.00 dollars for taxes.