Passage: On 24 February, Boris Kevorkov, the Nagorno-Karabakh autonomous region party secretary and an Azerbaijan loyalist, was dismissed.Karabakh Armenian leaders complained that the region had neither Armenian language textbooks in schools nor in television broadcasting, and that Azerbaijan's Communist Party General Secretary Heydar Aliyev had extensively attempted to "Azerify" the region and increase the influence and the number of Azerbaijanis living in Nagorno-Karabakh, while at the same time reducing its Armenian population (in 1987, Aliyev would step down as General Secretary of Azerbaijan's Politburo). By 1988, the Armenian population of Karabakh had dwindled to nearly three-quarters of the total population.The movement was spearheaded by popular Armenian figures and found support among intellectuals in Russia as well. According to journalist Thomas de Waal some members of the Russian intelligentsia, such as the dissident Andrei Sakharov expressed support for Armenians. More prominent support for the movement among the Moscow elite was interpreted by some in the public: in November 1987 L'Humanité published the personal comments made by Abel Aganbegyan, an economic adviser to Gorbachev, to Armenians living in France, in which he suggested that Nagorno-Karabakh could be ceded to Armenia. Prior to the declaration, Armenians had begun to protest and stage workers' strikes in Yerevan, demanding a unification with the enclave. This prompted Azerbaijani counter-protests in Baku.

Question: What did Armenians do in Yerevan to protest Russian support for Azerbaijani control of Nagorno-Karabakh?
stage workers' strikes