Here's a screen shot from a 1952 UPCI Ministers Directory. At this time the "Colored Ministers" were just 5 in number, and two of those appear to have been a husband/wife team. The purpose behind the segregation is puzzling if no bias was intended. This manual is available in PDF format from some spiritual abuse site or another.
I wanted to add this note... I am aware of a discussion that took place here on AFF recently over the use of the phrases "colored" and "people of color." The term "people of color" was coined back in the 1980's as a new politically correct way of identifying not only African-Americans but just about anybody who wanted to be included.
Some people felt this was pandering and condescension and so the phrase has fallen out of use in many areas. The phrase "colored people" harkens back to segregation and Jim Crow and so many don't like to use it.
However, when a person is citing historical sources and quoting things like the above minister's directory, historical integrity requires that you accurately quote the source. Unfortunately, this can bring up some bad feelings. My thought on this issue is this: if the use of a phrase that was common during a particular time period conveys certain feelings then so be it.
I find racism to be repugnant. If I am quoting something that was not considered "repugnant" by many people in the past but is "repugnant" today, then the feelings that arise actually help me to tell the story. Racism was very common in America, indeed all around the globe. In our little corner of the world we have made some good progress in overcoming these things. But to keep the ground that we've gained we need to remind ourselves of the past.
I mean no offense in using the language of the past. If you feel offended by some of these things, well... that's part of my point. I'm offended by these things as well. The way to fight the bad things of the past is not to ignore it but to confront and defeat it.