The biggest donor to my former org (and leader) turned out to be an undercover FBI agent so yeah she was definitely getting paid but the money "came" from a fake job. Refusing to say almost makes me think they aren't feds because they set up their undercovers with a backstory usually, unless they just got lazy with y'all.

I'd insist on disclosure regardless, it is very suspicious for your leader to be getting mystery money. How could you not suspect corruption? They shouldn't be trying to hide that from their comrades and subordinates.