Nemesio Rubén Oseguera Cervantes A bulletin board assembled in 2019 by the Courier Journal of Louisville, Kentucky, displaying research materials and photographs related to Nemesio “El Mencho” Oseguera Cervantes, leader of the Cartel de Jalisco Nueva Generación (CJNG; Jalisco New Generation Cartel). (more) Who Was El Mencho? Written by Katie Angell Katie Angell is Associate Editor at Encyclopedia Britannica, covering topics related to Latin America. She holds an MA from Vanderbilt University and is pursuing a PhD in Political Science. Katie Angell Fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated Feb. 24, 2026 •History Nemesio Rubén Oseguera CervantesA bulletin board assembled in 2019 by the Courier Journal of Louisville, Kentucky, displaying research materials and photographs related to Nemesio “El Mencho” Oseguera Cervantes, leader of the Cartel de Jalisco Nueva Generación (CJNG; Jalisco New Generation Cartel).© Kyle Slagle—Louisville Courier Journal/Imagn Images Nemesio Rubén Oseguera Cervantes, notoriously known as “El Mencho,” was the leader of the Cartel de Jalisco Nueva Generación (CJNG; Jalisco New Generation Cartel), one of Mexico’s most powerful...

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