Organized crime groups in Estonia

The Obshchak (), obštšak (Estonian spelling), or ühiskassa (Estonian) or "common treasury" is a traditional umbrella organisation of criminal groups in Estonia, a trade union of sorts that settles conflicts and establishes boundaries of the spheres of interest of various groups such as the Russian mafia and Estonian organized crime. Between 2003 and 2016, the Common Fund was dominated by Nikolai Tarankov (1953–2016) of Russian heritage and KGB training. Tarankov was found murdered in Haapsalu, apparently in a revenge murder related to his past actions.