Fentanyl sales. Arms dealing. Kidnapping. Extortion. Murder. Court documents from Thursday’s massive Mexican Mafia takedown revealed the terrifying alleged crimes of foot soldiers conducting the gang’s sinister business in Southern California. The California Post watched Thursday as FBI agents executed a raid on the bungalow of Andrew “Speedy” Hernandez — just one of 43 alleged gangsters arrested in 30 stunning raids targeting the Mafia’s crimes in Orange County. Wearing camo and packing