One of the most interesting fields for understanding human behavior is evolutionary psychology (the successor to sociobiology). Despite appearances to the contrary, this field includes both conservatives and liberals. It continues to provoke, however, tremendous debates on both political and theoretical issues.
One of these debates involves the level at which natural selection occurs. One way of framing this issue is whether natural selection operates only at the level of the gene or also at other levels, including the group. People who believe that group selection occurs often describe themselves as favoring multilevel selection, since they believe selection occurs at multiple levels. (I should note that advocates of multilevel selection might not agree with the way that this paragraph defines the debate.)