The RAW mentions using Charm or Leadership to sway individuals, with advantages applying to extend the influence to (single) additional targets. But the RAW doesn't really address situations where one is addressing a large crowd (say a few hundred or thousand on a stage, or via media could even be millions across an entire planet). How many get affected by your skill check? Something like how trade works, where the dice get interpreted as affecting a percentage of the crowd, would be ideal.
If a group has a frigate or cruiser and they need to hire crew for it, they'll need hundreds, perhaps thousands, of minion-caliber NPCs. The game is geared towards small groups with small needs, and doesn't really provide guidance on players setting up and controlling a large organization. d20 Saga had rules for managing organizations, but it, too, didn't address building it in the first place (or growing it).