Aldo is a minion of Abaddon.
Aldo was sent to hear the intel that has been gathered by Lola on Crowley. When she relays the information that in addition to pizza, sex and human blood, that the Winchesters have been calling Crowley leaving voicemails asking about the First Blade, he tells her to follow up on that development and report back in.
It is unknown what happened to Aldo following Abaddon's death as Crowley was seen to execute Abaddon Loyalists.
- Blade Runners