How to Scoop Up the Mass of a Black Hole?

Supermassive black holes were already in place as quazars when the universe was a fraction of its age. How do you scoop up so much mass? It's such an interesting mystery that you know your gong to make something that's a billion sons worth of mass, but you don't have it yet. You need certain sets of physical conditions a in the universe. If somehow you're able to trigger that kind of instability in the gas very early on, then you can syphon scoop up a lot of gas down the centre to make a very massive black hole.