Is my understanding correct? I like it.
You have the right of it!
As always, I find myself somewhat puzzled by the notion of Leader and its scope. If I want to instill a new Defining Principle in the poor, the beggars and the downtrodden, must I find some King of Thieves to speak to first?
I have designed Socialize to be very powerful, but it has two main limitations.
1) It may require a definite social group in order to use it, as Taboo-Inflicting Diatribe does.
2) It may require the context of a social construct or scenario.
Some of the Charms are individual, person-to-person Social influence Charms, most of which fall into group 2.
If you want to inflict a taboo on a lot of individual beggars who aren't a group, you will struggle. Generally, though, I think you can find someone who you can identify as a leader, even in a den of thieves or a barrow of homeless. Alternately, you can promote someone to the role.