A video of Mervin Yamarte with his head shaved and his eyes lowered alerted his family to his deportation from the United States and his imprisonment in El Salvador. He is accused of belonging to the Tren de Aragua, a criminal gang in his country, Venezuela. "My son wanted to return because he said that this was not the American dream, it was the American nightmare," says his mother, Mercedes Yamarte, whose four children emigrated, three to the United States and one to Mexico. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES