Actually Emmanuel Goldstein was a contemporary of Orwell's and a poet and prominent anarchist at the time. In some literary circles, it is believed that Orwell's character "Goldstein" was based on Emmanuel Goldstein.
As for the 2600 magazine reference...When Eric Gorden Corley started publishing 2600 magazine (interestingly enough, in 1984) he adopted the name, but early readers will recall the decidedly anarchist overtones of the publication. He claims he took the name Emmanuel Goldstein from 1984, but he was either fully aware of the double meaning of the name, or ironically ignorant of it.
And for the record, I answered before pstarr, so I win.

The whole of human history is a refutation by experiment of the concept of "moral world order". - Friedrich Nietzsche