At least 44 people have been killed in six days of violence as Brazilian soldiers and police crackdown on violent drug gangs. The police said they controlled the Vila Cruzeiro shanty town after battling drug dealers regrouped there to disrupt a police pacification programme which aims at improving security and the rule of law in Rio. Will Rio’s pacification programme achieve its goals? Should other countries opt for similar programmes? How best can the world tackle drug gangs?