Server Gated Cryptography is a legacy technology (implemented by obsolete laws) that allows older browsers to establish a SSL session at a higher encryption.
This article says SGC should never be used and it enables malicious (hacker) use, at the same time, there is a contradicting opinion at the bottom of the article.
Also, I noticed that some sites still support SGC encryption, but also have an "A" rating by SSL Labs.
Is it actually bad to support SGC?
What is special about a SGC certificate, or webserver that makes it "work". I'd like to understand how it works so I can properly shut it down.