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The class numbers for the second type of group are given the same way. Style, if any; country; century, etc. I assume that books on an individual artist in that group would get the class number for special artists within the country class number.
Sherman's bottom line:
Styles or movements are generally treated through cuttering under a period and artist groups will be treated under A-Z for special artist. You may very well find collectives established some time ago that you wouldn't treat that way today. Groups that wrote manifestos would probably be treated a agents of collective thought (corporate bodies) today. If the group/movement is already established, generally accept how it was established, whether NAF or SAF.
Movement refers to broader concept. See H1250: "The style may be characterized more narrowly as a movement if the particular manner of expression is the result of artists working toward common goals and under the same set of conventions." Examples include: Cubism ; and, Impressionism (Art).
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