 In 2013 Linderman became the unofficial leader of a newly founded organization “Let’s Protect Our Children” that along with another organization called "Kin" began collecting signatures to initiate a referendum against "gay propaganda".In 2014 he and few other pro-Russian activists appeared in the Victory Day celebration at the Victory Memorial to Soviet Army in Victory Park, Riga, Latvia with flags of Donetsk People's Republic and expressed their support for the pro-Russian separatists.On May 8, 2018, Linderman was arrested by the Security Police for a suspected incitement of national, ethnic and racial hatred, performing activities aimed against Latvia’s independence, sovereignty, territorial integrity, state power and government structure, as well as organizing mass riots in a March 31 speech he gave at the "All-Latvian Parents Gathering" organized by the Latvian Russian Union.