The organisation was formed in 2015 as an animal rights group, focused on safeguarding of stray dogs.[2] In 2016, the movement became popular when videos of the members of organisation rescuing animals showed up on social media, as well as videos of them offering compensation for information on animal abusers.[3] Initially, the movement only focused on animal rights issues, exposing animal abusers, and taking their animals away from them.[4] However, the movement has shifted from solely being an animal rights group to openly talking about political issues, mainly illegal immigration.[5] In 2020, the organisation announced that they will be forming a party that will participate in the 2020 parliamentary election, in a coalition with the far-right anti-vax "I live for Serbia" movement.
Its leader, Pavle Bihali, appeared under a Russian minority ballot list for the 2022 election which was ultimately rejected by the Republic Electoral Commission (RIK) because it did not collect enough valid signatures. According to CeSID, the ballot list did not support minority rights, but far-right politics.[6] This was later overturned by the Constitutional Court, and on 22 March, RIK confirmed the ballot list.[7] The list did not enter parliament.
In July 2023, the Constitutional Court of Serbia received a proposal from the Public Prosecutor's Office to ban Leviathan. According to the Public Prosecutor's Office of Serbia, Leviathan is a "paramilitary citizens association" and has been "aiming at violating guaranteed human or minority rights and caused racial, national and religious hatred".[8]
In April 2020, members of the movement took the family dog of a Romani family away from them, claiming that the dog was abused and that it was used for dog fights. However this claim was denied by the people living in the neighbourhood.[23] Not long after, a member of Leviathan drove through the gate of a refugee camp in Obrenovac, threatening to run over the refugees. After the attacker was arrested, the members of the movement protested in front of the camp.[24]
In October 2020, police in Belgrade have arrested six members of Leviathan who are suspected of beating one person earlier that month.[25]
^Mulhall, Joe; Khan-Ruf, Safya; Bego, Fabio (2021). "Spotlight on the Western Balkans: Far-right trends in the region". State of Hate: Far-Right Extremism in Europe. London: Hope Not Hate; Amadeu Antonio Foundation; EXPO Foundation. p. 108.