Russia has added the Free Russia Forum, a platform uniting leading figures of Russias liberal opposition, to its list of undesirable organizations, the Prosecutor General's Office said Wednesday.The Prosecutor General's Office said a review of the Lithuania-based organization's activities concluded that it poses a threat to the constitutional order and security of the Russian Federation.Organizations labeled as undesirable must disband within Russia, and individuals who cooperate with undesirable groups run the risk of felony charges.The Free Russia Forum has not yet responded to the designation.The forum was co-founded by Russian chess grandmaster-turned-political activist Garry Kasparov and opposition politician Ivan Tyutrin in 2016, when the group organized the first conference of the Russian opposition.Since then, it has held a total of 11 opposition conferences and three conferences uniting Russian anti-war activists and opposition figures.Among the many groups working under the Free Russia Forums umbrella are allies of jailed Kremlin critic Alexei Navalny, the liberal PARNAS and Yabloko parties and the Memorial human rights group.Russian authorities have moved to gradually restrict the countrys civil society groups, opposition activists and independent press over the past decade, with the crackdown escalating drastically following the invasion of Ukraine.Last week, Meduza, one of the most popular independent Russian-language news websites, was also labeled an undesirable organization, with the Prosecutor Generals Office also citing its alleged threat to Russias constitutional order and security.