10. Memphis, Tennessee
According to the Memphis police department, the rise in homicides in the city may be linked to gang violence. Out of 147 homicides in 2011, 36 were gang affiliated, and 68 percent of the murders involved people related or acquainted to one another. The police director recently acknowledged that youth crime and gang violence is a big problem in Memphis. In addition to a high violent crime rate, the entire state of Tennessee scored poorly on the Peace Index from the Institute for Economics & Peace, which measured access to weapons and percentage of citizens who are behind bars.