Founded by Paco "Speedy" Gonzalez after his departure from the Los Santos Vagos, Las Calaveras or "The Skulls" are an up and coming gang aiming to take and keep control of Los Santos's east side.
LC have an emphasis on family, as a crew. Anyone who falls out of line, or causes continued issues for the family, gets a beat down by the crew as a lesson. The group mostly worked the weed game, playing a game of chess against perceived enemies and allies.
They were involved in an attack on Jamestown against Francisco Alvarez (Pancho) in an attempt to kill him. A small explosive device was unleashed, as well as gunfire against him, as Pancho hid amongst the local Vagos. Most LC members had an active grudge against him for evicting them out of Jamestown, and pushing members out of the Vagos, which lead to them forming Las Calaveras. In this attempt, LC took claim of Jamestown, as other active Vagos weren't around. Any who did pop up, over time, worked as tentative allies with the group. LC watched over Jamestown with the Vagos.
Afterwards, LC attempted to work towards collaborating with Aztecas, and what scattered Vagos members were around, to push the weed game into an operating chain from supply to distribution across sections of San Andreas. Before the plan could go into motion, Raul Mota shot both Archie Cooper and Marco Romano in the back during a karaoke event at the Vinewood Bowl, putting them both in the hospital.
During the manhunt for Raul, Raul contacted the Las Calaveras leader, Paco Gonzalez, asking Paco to deliver him a swift and respectful death, realizing the error in his ways, as allies and the Aztecas turned their backs on him, and he had multiple groups looking for him. Both Paco and Lauren Agostini were present when they killed Raul, and took the proof to Grove.