Were there any black secretaries working in New York during the late 1960s?

This isn’t a racist question or anything like that, I’m a mixed black person myself.I’m only asking because there is a movie coming up and there is casting call roles they want people to act in.They said to pick any of the roles which included the secretary part and has to be based back in New York in the late 60s.

I don’t want to cast for it then later the casting directors telling me they aren’t looking for a black female to play in it not sure if they would mind giving me another role instead.

I think they’re most likely talking about the ones who are into the system and establisment called by the hippies.