A Snarkling is a card carrying member of the St Johns Worrywort Society
Is there a rule of thumb about including a significant mention of a real organization in a work of fiction? Such as having a murder mystery series having a recurring set of characters who are all members of a nationally known civic or charity group, and having the local chapter's meetings and activities be a background setting where some of the players interact during various parts of each novel's plot? As an agent, would this give you heartburn?
Like The DaVinci Code mentioning the Catholic Church?
Like Jennifer Weiner mentioning Princeton?
Like PD James mentioning Scotland Yard?
Robert Crais staging a shootout at Disneyland?
On the other hand April Henry's publisher Harper Collins had her invent an auction house rather than use Sothebys in her first mystery.
And those mean assed librarians at the ALA might get miffed if the president of the organization turned out to be the killer in your next mystery, Dewey Decimates Dallas.
You can use "public figures" in fiction. That includes public institutions and companies. Sometimes publishers get nervous not because it's illegal or actionable but because fending off a suit is expensive and time consuming.
It's certainly not a deal breaker at the query to the agent stage, at least not with me.