Antonio Navarro, 19, entered the plea in US District Court in Minneapolis yesterday, clearing the way for the state to proceed on charges that include kidnapping, assault and robbery, the St Paul Pioneer Press reported.
Navarro and the three other men are accused of kidnapping and torturing two Minneapolis teens they suspected of stealing drugs and money from the house in a quiet St Paul neighbourhood.
Navarro and Juan Ricardo Elenes Villalvazo, 32, kept the "stash house" for the cartel, according to court records.
Jesus Ramirez, 31, and Jonatan Delgado Alvarez, 22, both of Los Angeles, flew to the Twin Cities in April after meth and USD 200,000 in cash were stolen from the house, the federal indictment said.
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Prosecutors say all four men kidnapped two Minneapolis teens suspected in the theft, brought them to the house and tortured them. The teens were released after the men determined they didn't know what happened to the drugs and money, but not before nearly severing one teen's finger with a scissors as they were interrogating him.
Villalvazo, who prosecutors say was responsible for injuring the teen's finger, was still at large.