Robertson became active in the Edinburgh Secular Society, soon after.

Entity and relation annotations:
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type: entity
value: text: Robertson
labels: <Person>
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type: entity
value: text: the Edinburgh Secular Society
labels: <Organization>
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type: entity
value: text: Edinburgh
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labels: Organization:located_in:Location
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labels: Person:belongs_to_NORP:Organization
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labels: Person:visits:Location
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