Yes, blackies. Light blue, dark blue, red and black. You don't see these very often on the lower levels, but when you reach deity, people become unhappy pretty quickly. Usually you have luxuries, improvements or units to make them happier, so you don't see them on the top of the city screen often either.
So where do you find them? Click the button Happy (or something like it) in the city screen. Here you can see what wonders, units, improvements and luxuries do to your citizens. The top row is the orignial state, the state your citizens would be in had the city been empty, no happiness wonders, no luxuries, no improvements and no units. With many cities (in large empires) you usually find at least one black guy in every city.
With two luxuries they become happy, but units and temples first make them red and then content.
Welcome to CFC btw.

If you have more questions, or something isn't clear, feel free to ask about it. The War academy for Civ2 gives a lot of answers as well.