Affiliation
Definition 1 of 4

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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