What these three guests have in common, apart from a lengthy track record of

laboring in the civil-rights vineyard--going back in Mr. Bunzel's case to 1946, when he founded the Liberal Union at Princeton--is that (a) they had just been nominated by President Reagan to serve on the U.S. Civil Rights Commission, and (b) they had been hotly opposed by a variety of social activists--largely, one supposes, because of who nominated them. Although there are no fireworks, guests and host being substantially in agreement as to the unacceptability both of old-fashioned racial discrimination and of modern reverse discrimination, there is plenty to talk about. MBA: "In 1979 President Carter offered me a seat on the Civil Rights Commission. I said that I wanted the President to understand that I differed with his views about preferential treatment by race and quotas. Therefore, three days later I received a phone call saying I would not be appointed, and I thought it was President Carter's perfect right to do that. It is in the Executive Branch." ... LC: "You have a preponderance of blacks and other minorities who continue to earn a great deal less than whites as a group.... And I think that what many minorities are grasping for is a way in which to tie that in some way to race, and to try to seek a solution where, frankly, I don't think it's going to be found."