Since late 2006, some 45, 000 soldiers have been deployed to take on the drug gangs.
Street gangs in the northern triangle also fight deadly battles often unrelated to the drug trade.
His most recent research utilized modelling techniques to better understand gangs and their involvement in gun crime.
In Chicago street gangs control 95 percent of the retail drug sales in Chicago.
We have not focused on the gangs in the last 15 years, really, in Chicago.
How it's different from the approach that city leaders are currently taking to gangs.
Ms Hughes also said there were intelligence-led efforts to tackle organised gangs of "people smugglers".
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Latest sight in Kingston, Jamaica: gangs of young Rastafarians known as "grenade brigades" roaming the streets.
When I was a kid, the neighborhood where I lived was run by gangs.
One of the reasons that violent gangs and narcotics abuse flourish in Mexico .
The MS-13 gangs have cliques, or factions, located throughout the United States and Latin America.
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Lawlessness in the region has also allowed sectarian groups and criminal gangs to operate.
They were arrested by police investigating a feud between rival gangs in Croxteth and Norris Green.
It calls for more support for families and communities to prevent young people joining gangs.
The guidance is aimed at early identification of children at risk of becoming involved with gangs.
As you drive around the division you go from block to block and the gangs change.
Those who work against the gangs say regarding it as simple crime just doesn't work.
Well-organized international criminal syndicates and local gangs play key roles in both internal and cross-border trafficking.
There's also more racial tension between Compton's black and Latino gangs than ever before.
Det Con Scott Jardine said most of the incidents were linked to East Asian crime gangs.
The audacity of Brazil's criminal gangs, and the impunity they enjoy even behind bars, is chilling.
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But in 1971 a peace deal was reached between Puerto Rican and African-American gangs.
He partly credits an increasing focus on youth gangs and the way they communicate.
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Looters and armed gangs are reported to be still roaming the streets of Bangui.
Work has also begun to identify the individuals and gangs behind the malicious domains.
But that has changed as border security increased to deal with illegal immigration and drug gangs.
Gangs of youths had gathered in response to an alleged attack on a nearby mosque.
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After years of complacency, tackling the trafficking gangs was never going to be easy.
That means gangs of phishers are now monitoring and copying each others' tactics, says Mather.
The meeting was set up to talk about guns and gangs in the area.
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