Memorial Faces Extremist Designation in Russia
Memorial, founded in 1987, documented Soviet-era repression.
Moscow liquidated Memorial in 2021 as a 'foreign agent'.
Memorial tracks over 1,000 political prisoners in Russia.
Natalya Estemirova was killed in 2009 linked to Memorial.
Yury Dmitriyev and Oleg Orlov were imprisoned for ties to Memorial.
Norwegian Nobel Committee chairman warns of Moscow's actions.