
Affiliation
Implied Support
Using 'affiliation' may suggest you support the group or cause you're connected with.

His affiliation with the charity suggests he endorses their cause.
Associate Discreetly
'Affiliation' sometimes implies a connection that isn't officially recognized.

He had a secret affiliation with the underground movement.
Compare with
AllianceAssociationCollaborateConnectionFellowshipMembershipPartnershipRelationship
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