Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Using intimidation and violence, Somalia-based Islamist militant group al-Shabab raises as much revenue as the country's authorities, a report says.

Somalia conflict: Al-Shabab 'collects more revenue than government'