I would say that groups of professionals with name and surnames and that we could somehow trace their ancestry because there are public records about them. In that sense, perhaps politicians are better than Sport people, because politicians are people from various social classes, different ages and generally they tend to be local in greater proportion.
Large groups of anonymous people would be even better off if we could somehow trace their origins, but this is rarely possible.
Not the actors, because they are chosen for their appearance for certain roles, so they usually have very extreme physical features in some sense, and usually in groups, they are not representative of society (although many are chosen precisely because they have the appearance of an average citizen. )
So among your options I would choose Politicians.
Edit: (and from not very large localities or at provincial or regional levels, even better)
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