Compilation of video messages that came from Jalisco New Generation Cartel (Spanish: Cártel de Jalisco Nueva Generación, CJNG). There is a chance some dates will be one or two days off simply because the earliest mention I found was not the first instance that it was uploaded to social media.
August 5th, 2019 - "CJNG issues video of captive, warns it will ‘clean up’ Valle de Santiago"
To everyone in the Valle de Santiago, we are the elite group of the four letters . . . We come to clean the municipality of all the plague, extortionists, kidnappers and killers of innocent people. A clear example, here we have the Michoacano, who was the head of the Valle de Santiago turf . . . We are coming for you, you filthy Marro, and all of your filthy people, those who entered the Valle de Santiago police station and killed innocent people.
August 13, 2019 - "CJNG announces fight against "El Abuelo" in Tepalcatepec"
August 14, 2019 - "CJNG points out to the governor of Jalisco having broken pact"
September 10, 2019 - "CJNG sends message to Tepalcatepec, Michoacan from El Mencho"
September 22, 2019 - "CJNG Panther Group Threatens El Marro, Assures They Will Take Over Guanajuato"
December 14, 2019 - "CJNG Elite Group interrogated policemen before dismembering them" in Guanajuato
Since this one is cut at 2:20, the original is presumably longer. Videos uploaded to Twitter are not allowed to be longer than 2:20 minutes, originals are often cut down to meet this requirement. At the moment I am unable to find a version that isn't watermarked and longer than 2:20 minutes so this will have to do.