A crown over a soccer ball. An eyeball that “looked cool.” Flowers. Those are some of the everyday tattoos that defense lawyers say helped lead to the sudden weekend deportation of roughly 200 Venezuelan men who are accused of being members of the ruthless gang Tren de Aragua. Tattoos are signals of membership in some Latin American gangs, with the facial tattoos of the El Salvadoran group MS-13 perhaps the best known. Experts, though, say tattoos are not central to Tren de Aragua. They also note that tattoos, hugely popular all over the world, are often nothing more than body...