Most of Sinaloa's origins are a mystery

It is most likely someone just joined the server one day with their friends and started parading around with weapons to look cool

That morphed into a kind of social club people would join

The history below this is written from Gluonmaster's perspective since I couldn't find much on the Sinaloa in DemocracyCraft

Gluon discovered she could mine drugs where she was, Gluon decided to form a drug cartel despite drugs being legal

Sinaloa got mad Gluon was selling drugs since she undermined their authority/exclusive right to sell

Gluon didn't realize the police had sanctioned Sinaloa 

The police turned a blind eye when Sinaloa attacked Gluon, but they got mad when Gluon fought back

Gluon was forced to go onto the run in the wilds and use the warp function to tp whenever Sinaloa found her (which was real easy due to player tracking maps)

Gluon ultimately made peace with Sinaloa after they got tired of chasing her, Gluon was however forced to stop selling drugs

Later under the cover of darkness Gluon went to the bank but she didn't realize that Sinaloa had a deal with the Police where they were allowed to rob the bank without getting in trouble

When Gluon arrived in the vault the money was gone, Gluon tried to escape but then police intercepted her in the bank lobby

Gluon opened fire and ran into the streets, she ran into a random house nearby while the police chased her

Unfortunately she ran into a government embassy, seeing two heavily armed diplomats, Gluon decided to preemptively open fire, she got a super lucky KO point blank shot on one of the diplomats who saw her armed and had run towards her with a sword. Gluon managed to run before the other could kill her

Gluon then fired on the police again but they caught up to her because Gluon didn't know how to use her gun and then they arrested her