The best and most accurate answer among to describe the method of essay organization that starts with a narrow focus and widens in scope throughout the essay is the specific-to-general organization.
Hope my answer has come to satisfy your query.
<em>"The Other Victims of the Nazis
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<em>Ina R. Friedman
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<em>Fifty years after the end of World War II, few people are aware that Jews were not the only victims of the Nazis. In addition to six million Jews, more than five million non-Jews were murdered under the Nazi regime. Among them were Gypsies, Jehovah's Witnesses, homosexuals, blacks, the physically and mentally disabled, political opponents of the Nazis, including Communists and Social Democrats, dissenting clergy, resistance fighters, prisoners of war, Slavic peoples, and many individuals from the artistic communities whose opinions and works Hitler condemned."</em>
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Intro- within
Extro- outside of
FYI synonyms are words that have the same or almost the same meaning, antonyms are words that are completely opposite.