insider
//ɪnˈsaɪdər//
Noun
insiderSingular
insidersPlural
1
A person who is within or belongs to a particular organization, group, or circle and has access to confidential or privileged information
Only insiders knew about the company's plans to merge.
2
A person who has special knowledge or influence within a particular field or industry
As a political insider, she knew about the policy changes before they were announced.