Labour’s plans aim to spot youths most in danger of becoming involved and step in with support.
There will also be youth mentors in A&E units and custody centres to target potential gang members.
Ms Cooper will tell the party conference that the rise of county lines gangs, damaging social media content and Covid have all had negative effects.
She will add: “We need urgent interventions to stop young people getting drawn into crime or exploitation in the first place.
“For too long, teenagers have been pushed from pillar to post between local authorities, mental health services, the police and youth offending teams.
“That’s why we are setting up a cross-Government ‘tough love’ initiative with new youth hubs and proper local plans to identify those most at risk and help them.
“And for those who repeatedly cause trouble in their community or are found carrying knives, there needs to be stronger interventions and clear consequences to stop their behaviour escalating and to keep other young people safe.”
Knives or sharp objects were used in 75% of teenage murders compared with 40% in adults, Office for National Statistics data from February showed.
Some 99 people under 25 were murdered with a knife or sharp object in the 12 months to March last year – with 13 being under 16.
The Young Futures programme will receive up to £100million a year if Labour gains power.
