The scheme, named ‘Shield’, will see the main offender’s prosecution fast-tracked with other gang members also facing sanctions.
The London Mayor’s Office for Policing And Crime (MOPAC) is providing £200,000 funding for the pilot, which will be trialled in Haringey, Westminster and Lambeth.
The Mayor of London, Boris Johnson, said the pilot would give gangs a “clear ultimatum”.
Mr Johnson added: “The police know who you are and if anyone in the gang steps out of line then every member will face consequences.”
Stephen Greenhalgh, deputy mayor for policing and crime, said: “It doesn’t mean a gang member of whatever age is going to get the same sanction as the person that is the brains behind the machine that is causing the mayhem.
“The rules are that whole gangs will be chased after by whatever means.”
However campaigner Gloria Morrison (she represents Joint Enterprise: Not Guilty by Association) questioned whether the new pilot could lead to some young people being criminalised.
She argued: “How are they deciding who is in a gang?
“The idea to put everyone in the same boat because one person has done something is really wrong.”
According to the Met Police, gangs in the capital are still responsible for 40% of all shootings and 20% of all recorded violent crime.
There are 186 gangs in the capital with 58 accounting for two-thirds of offences where a named gang is identified.
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