by Gerardo del Valle, ProPublica, and Alejandro Bonilla Surez and Edwin Corona Ramos for ProPublica ProPublica is a nonprofit newsroom that investigates abuses of power. Sign up to receive our biggest stories as soon as theyre published. This article is co-published with The Texas Tribune, a nonprofit, nonpartisan local newsroom that informs and engages with Texans, and Alianza Rebelde Investiga and Cazadores de Fake News. The Trump administrations move four months ago to send more than 230 Venezuelan migrants to a maximum-security prison in El Salvador known as CECOT took a staggering toll, not only on the men themselves but also on their families. The men were released to Venezuela on July 18 as part of a prisoner swap without much explanation, and they and their relatives have begun sharing the details of their ordeal.Juan Jos Ramos Ramos describes the physical torture he says he endured during his incarceration at CECOT as his mother, Lina Ramos, explains the emotional agony of not knowing whether shed ever see her son again. Andry Blanco Bonilla and his mother, Carmen Bonilla, still struggle to make sense of how they could have been caught up in something like this when Blanco didnt have a criminal record and, in fact, had a deportation order to be sent back to his home country. Wilmer Vega Sandia, who had migrated to the United States to find work that would help him pay for his mothers cancer treatment, says he prayed every day of his incarceration that hed make it home in time to hold her in his arms.Without providing evidence, the U.S. government branded them all Tren de Aragua gang members, the worst of the worst, sick animals and monsters. Our reporting, a first-of-its-kind, case-by-case examination, shows how the government knew a majority of them had not been convicted of a crime in the U.S. and only a few had serious convictions such as assault and gun possession. We found a dozen or so had criminal records abroad and included those in our comprehensive database, too.Nearly half, 118 of the more than 230 men, including Ramos, came to the U.S. legally and were deported in the middle of their immigration cases. He entered the U.S. with a CBP One appointment, a program the Biden administration used to try to bring order to the soaring numbers of migrants attempting to enter the country. At least 166 of the more than 230 men had tattoos, including Blanco, Ramos and Vega. Our investigation found that the government relied heavily on tattoos to tie the men to the Venezuelan gang, even though Tren de Aragua experts say tattoos are not reliable indicators of gang affiliation.A handful of the men, including Vega, had been granted voluntary departures by an immigration judge, which means they had agreed to pay their way home to Venezuela. Instead, they were deported to El Salvador.Watch the video here. Melissa Sanchez, Perla Trevizo, Mica Rosenberg and Gabriel Sandoval of ProPublica; Ronna Rsquez of Alianza Rebelde Investiga; and Adrin Gonzlez of Cazadores de Fake News contributed reporting. Mauricio Rodrguez Pons and Almudena Toral of ProPublica contributed production.