Both Uses

liaison
in
The Bourne Identity
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There was an article about East German interference with the Bonn government's liaison office in Warsaw.†
Chpt 10 *
Yet she was disciplined; all things considered, an estimable liaison to Carlos.†
Chpt 14

Definitions:

(1) (liaison as in: She is their liaison)
a person with the role of increasing communication and cooperation between two organizations
(2) (meaning too rare to warrant focus)
In classic literature, liaison can refer to a sexual meeting or affair -- especially one kept secret. Liaison can also reference a communication link or an instance of communicating. Even more rarely, liaison can reference something used to thicken a sauce while cooking.