insider
US /ɪnˈsaɪ.dɚ/
UK /ɪnˈsaɪ.dɚ/

1.
insider, addetto ai lavori
a person within a group or organization, especially someone who has special knowledge or access to information not available to outsiders
:
•
As an insider, she knew all the secrets of the company.
Come insider, conosceva tutti i segreti dell'azienda.
•
The police suspect an insider helped the thieves.
La polizia sospetta che un insider abbia aiutato i ladri.