Four of 12 co-defendants in a group suspected by Hall County authorities of trafficking some 8,800 pounds of methamphetamine have pleaded guilty in federal court. Members of the “Lenox Park Cartel,” as it’s informally known by law enforcement, were arrested in September 2015, and authorities seized roughly $1 million in meth, cocaine and marijuana. Four of them — Christel Ivester, of Toccoa, and Alejandro Avila, William Suarez and Carlos Alfredo Cantero-Cruz, all of Gainesville — have entered guilty pleas, according to court documents.