NORRISTOWN — In profanity-laced Instagram messages and videos, some members of the All Black Bandits/300s street gang threatened a member of the rival Grimy Boys/6’s gang just hours before they fatally shot him outside his Norristown residence, allegedly because he made derogatory remarks about a 300s member killed in Philadelphia, according to testimony.
Montgomery County Detective Lt. James Lavin testified on Tuesday that authorities uncovered a feud between members of the two rival factions in Norristown. The “300s” is a reference to the 300 block of Marshall Street in the borough’s east end and the “6’s” is a reference to the 600 block of Chain Street in the west end of town.
Lavin, supervisor of the district attorney’s Violent Crime Unit, showed a jury a series of social media exchanges that prosecutors maintain showed that the 9:43 p.m. May 23, 2025, fatal gunshot slaying of 20-year-old Tahaj Andru “Pooh” Harrison, a member of the Grimy Boys, was borne from a rivalry between the two gangs…