This trial studies the impact of a public summer jobs program in reducing violence. The 2012 One Summer Plus (OSP) program in Chicago offers 7-8 weeks of part-time summer employment at Illinois’ minimum wage ($8.25/hour). Local community organizations place youth in nonprofit and government jobs (for example, summer camp counselors, workers in a community garden, or office assistants for an alderman). Youth are assigned job mentors—adults who help them learn to be successful employees and to navigate barriers to employment—at a ratio of about 10 to 1. Half of youth in the treatment group were randomly offered social-emotional learning (SEL) programming based on cognitive behavioral therapy principles, aimed at teaching youth to understand and manage the aspects of their thoughts, emotions, and behavior that might interfere with employment. Control youth are excluded from the program but are free to pursue other employment opportunities of their own volition.