Aschen Confederation

The Aschen Confederacy is an interstellar government in the Milky Way. While the Aschen offer membership to any planet by offering advanced technology, it is really a long term colonization method. The various "vaccines" and technological experiments are attempts to render the native populations incapable of reproducing, wiping out the native populations and allowing the Aschen to take over the planets. SG-1 made contact with the Aschen, but they eventually learned the truth about their plans. The Aschen tried to send a bomb to Earth through the Stargate, but it failed to penetrate the Iris.

Alternate
In an alternate timeline, Earth did become a member of the Achen Confederacy in 2000. Ten years later, the former members of SG-1 learned of the Aschen's plans, and were able to send a warning to the past by sending a note through the Stargate after opening it at the same time as a solar flare.