Oliver Stone had been accompanied by a Secret Service agent when he'd visited Gray's demolished house. That too was interesting. He would have to get acquainted with Agent Alex Ford.
--- I think A. Ford was a S.S. agent. Does it help?
I think it just means: He had to know A. Ford.
If the agent he had been accompanied by during the visit was A. Ford, he has already met him and he feels he should get to know him better. The text doesn't make it completely clear whether the agent referred to and A.Ford are one and the same or not. (I would suspect that they are.)