They will be parasitized by the parasitic aphid wasp in a few days. It is all part of the big game.
You can order boxes of the orange spotted lady bugs or parasitic wasps and turn them loose in your yard. Lady bugs, parasitic wasps and lacewings feed upon them. If you have a sufficient population, they will naturally attract one or more of these natural predators anyway.
It is interesting to watch wasps apparently farm these aphid colonies. Don’t know if the eat the aphids, but they seem to go after the sugary aphid secretions.