I. C. Frimu  Ion Costache Frimu ( – ) was a Romanian socialist militant and politician, a leading member of the Social Democratic Party of Romania (PSDR) and labor activist. He died after beatings received and contracting an illness in prison, where he was being held for his participation in the typographic workers' demonstration of December 1918. Frimu, born in Bârzeşti, Vaslui County, was a carpenter by trade. He was active in various trade unions after being appointed cashier of a fraternal society, and worked his way up through the hierarchy. On March 31, 1893, the Romanian Social-Democratic Workers' Party (PSDMR) was founded in Bucharest. Frimu was part of the leadership, as were Ioan Nădejde, Vasile Morţun, Constantin Dobrogeanu-Gherea, Alexandru Ionescu, Christian Rakovsky, Dimitrie Marinescu and Ilie Moscovici. In December 1896, the Union of Guild Syndicates (USB) was founded, marking a crucial step in the centralization of workers' syndicate organisations. Frimu was elected president of the USB in 1898. In 1899 the PSDMR disbanded when various factions broke away (among them, that led by Morţun). The workers' clubs were also dissolved, with the exception of the Bucharest club, where individuals like Frimu, C. Z. Buzdugan and Rakovsky continued their activity. Around that time, he met the tailor and socialist sympathiser Rozalia (also known as Rozica), a Transylvanian-born orphan who had settled in Bucharest during her late teens, and whom he married in 1901. He founded and took part in the leadership of the newspaper "România Muncitoare". In March 1905, I. C. Frimu helped establish the Bucharest Carpenters' Union (being elected its president), and, in 1907, joined the leadership of the Socialist Union of Romania — the embryo of the post-1910 PSDR. The Socialist Union's creation came at the same time as the Romanian Peasants' Revolt — the government's suspicion of the socialist camp resulted in the expulsion of many "România Muncitoare" contributors, Rakovsky among them; the Frimus maintained contacts with the exiled (including the brothers Hoppe, who had settled in Vienna). In 1909, I. C. Frimu and the future novelist Panait Istrati were imprisoned in Văcăreşti prison, after taking part in riots asking the National Liberal cabinet of Ion I. C. Brătianu to receive Rakovsky back into Romania.