Typically a G-man means a government man (the usage is American and usually referred to a Federal agent). I don't know the game you are referring to though so this could be wrong.
Referring to this G-Man, from a little known game called 'half life'
It's been 20 years since I played that! I do remember him lurking around, now you mention it.
Rival faction in the Combine
If you spawn a Gman npc in Half-Life 2, combine soldiers will be hostile towards him, so I don't think his employers are affiliated with the Combine
Google.
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