The clan have close links to the Kremlin and have been given access to the site by Jozef Hambálek who is a friend of Slovakia’s Minister of the Interior Robert Kaliňák.
They have also been granted access to an array of military equipment such a army tanks thanks to management at the Military History Museum of Slovakia but according to the nation’s Ministry of Defence this must be returned by them at the end of this month.
The cronies have a rocker-like appearance but are one of many organisations that perform intelligence and military tasks for the Kremlin.
They were also involved in the annexation of Crimea, Ukraine.
Up to 11 members of the group, including the leader of the group Alexander Saldostanow, received campaign medals “for the recapture of Crimea”, which saw three of the 5,000-strong gang killed while fighting.
Mr Saldostanow personally received a Medal of Honour for his work on patriotic education and the commemoration of the fallen Russian soldiers in World War 2.
Monika Richter, expert on Kremlin activities in Europe from Czech think tank European Values said: “The night wolves have a symbiotic relationship with the Kremlin, which builds on political support in return for financial support, status and other benefits.”
The gang has more than 50 subgroups and is increasingly present outside of Russia.
Russian non-governmental groups are also responsible for the cyber-attacks that target attacks on Western institutions.
These organisations alone received over $ 1 million from the Russian government between 2013 and 2014.
Ms Richter said these activities should be seen as “another enemy element of the Kremlin aiming at weakening the transatlantic alliance and liberal democratic values”.
Slovakia is landlocked by a cluster of European countries including neighbouring Ukraine.
Last week, Russian President Putin signed a law commemorating Crimea’s accession to Russian Empire.