Goa'uld

Lord Ra's forces

Four Ha'tak and a Flagship appeared above an Asari world and deployed their death gliders and Al'kesh into the void of space, circling the planet. The planets communication systems were blocked by the Ha'tak, and a single message was broadcast down to the planet
"Kree! Bow before your god!" It said, but the Asari staunchly refused to bow before this alien invader. Suddenly the space ships descended upon the planet, the Al'kesh bombers laying waste to cities and Tal'teks deploying hordes of Jaffa down to the planet, who fought in such numbers with their deadly staff weapons in order to overpower the defenders. This was only a small world, and the Asari defenders were vastly outnumbered. Their attempts to surrender were rejected. There was no mercy as the Jaffa overrun them and murdered them brutally. Jaffa and Human slaves were planted on the world in their place, and the Death Gliders destroyed the few Asari spaceships that were around the planet. Only a single short message managed to get past the Communications jamming, sent off in random directions all over the galaxy, and it simply read "Help"
And when the fighting was done, Lord Ra added another world to his Dominion

Collective

For reasons unknown, the vast majority of the Collective has withdrawn within it's borders once more, at least within the Milky Way Galaxy, and has minimalised it's interaction with external species. They have, however, confirmed they will acknowledge the alliances they hold and will honour them should their allies ever be threatened and in need of assistance