In criminology, public-order crime is defined by Siegel (2004) as "crime which involves acts that interfere with the operations of society and the ability of people to function efficiently", i.e., it is behaviour that has been labelled criminal because it is contrary to shared norms, social values, and customs. Robertson (1989:123) maintains a crime is nothing more than "an act that contravenes a law". Generally speaking, deviancy is criminalized when it is too disruptive and has proved uncontrollable through informal sanctions.
Anti-immigration protesters and pro-migrant groups clashed in London and Manchester, with police making multiple arrests amid..