Serbian Organized Crime (Serbian: Cpпска мафија/Srpska Mafija, Serbian Mafia) are various criminal organizations based in Serbia or composed of ethnic Serbs in the Serbian diaspora. The organizations are primarily involved in smuggling, arms trafficking, heists, drug trafficking, protection rackets and illegal gambling. The Mafia is composed of several major organized groups, which in turn have wider networks throughout Europe. Ethnic Serb OC groups are organized in horizontally; higher-ranked members are not necessarily coordinated by any leader.