The College of Policing - a useful source for current research about the purposes and impacts of policing, with a particular focus on ‘effectiveness’ and how it is judged
http://www.college.police.uk/What-we-do/Research/Pages/default.aspx

Crime Control Strategies - the following link from a United States source gives a very succinct outline of the distinction between ‘crime prevention’ and ‘crime control’, outlining some of the implications for crime control activities:
http://what-when-how.com/police-science/crime-control-strategies-police/

The Centre for Crime and Justice Studies - a useful source of information and research on the criminal justice system in general, often providing a critical perspective on conventional assumptions. The following includes a brief reflection on the place of crime control as an objective of the justice system:
https://www.crimeandjustice.org.uk/resources/purpose-criminal-justice-system