A thug who killed a 21-year-old man as he tried to stop drugs being sold to his schoolboy brother has been given a life jail term with a minimum of 15 years.
Akeel Shah, 24, fatally stabbed Adnan Patel in the chest as he was surrounded by a gang in Stratford, east London, in July last year.
Shah, of North Birkbeck Road, Leytonstone, was sentenced for murder at the Old Bailey.
Mr Patel had been summoned to his 14-year-old brother's school to be told that the boy was being excluded because he was seen with cannabis. The victim, the eldest of five Patel brothers, felt responsible for his younger siblings since the death of their father
The Old Bailey heard that he, another brother and two men decided to confront Clint D'Mello, who the boy said had been supplying him. But when they got there, they were confronted by a gang armed with two knives and other weapons.
Shah was told he would serve a minimum of 15 years. He was found guilty following a trial last month.
D'Mello, 24, of Ashlin Road, Stratford, was jailed for four years for violent disorder.
Moneeb Khalid, 21, of Seventh Avenue, Manor Park, was jailed for 30 months and Mohsin Akram, 19, of Bradymead, Beckton, was given 28 months youth detention for the same offence.
Judge Anthony Morris told D'Mello he had sold drugs to the younger brother - and then assembled the gang.
He said: "The loss of his life over such a trifling dispute must be incomprehensible to his family."
