Los Santos, 1989. The city is filled with gangbangers, drug dealers, and corrupt cops.
Sweet (Sean) Johnson, the leader of the "Grove Street Families" gang, finds himself on a journey, that will bring his gang to the top. He was motivated to do this due to his brother's (Bryan Johnson's) death in 1987.
This is considered to be a fan made prequel to
Grand Theft Auto: San Andreas.
This story is fictional and has no relation to Rockstar North's
Grand Theft Auto: San Andreas. Which means that it is a fictional storyline.

Also Note that this mission series, was made in colaboration with Martin's Path.
His DYOM profile: http://dyom.gtagames.nl/profile/23706
His YouTube channel: https://www.youtube.com/channel/UCpSpyiD1NadCF3AHvdgI8JA

Link to the GTA Forums thread of this project: https://gtaforums.com/topic/934661-gta-grove-street-turf-sl