Alexandru Alecu Constantinescu was Romanian trade unionist, journalist and socialist and pacifist militant, one of the major advocates of the transformation of the Romanian socialist movement into a communist one.
Constantinescu was born in Bucharest, Romanias capital, in the family of tailor Ion Constantinescu. He enrolled in highschool, however due to financial problems he was forced to abandon it and work as an apprentice in an upholstery workshops. During this period he became acquainted with socialist ideas through the works of the early Romanian socialists Constantin Dobrogeanu Gherea, Anton Bacalbaa and Constantin Mille. In the 1890s he became a founder of one of the earliest Romanian trade unions, the Professional Association of Upholsterers, and later joined the Romanian Social Democratic Workers Party . However he soon grew disillusioned with the party leadership, and began attacking it for what he considered to be political and ideological inconsistency. The party itself was dissolved in 1899, when a large part of the leadership joined the National Liberal Party.
Source: Wikipedia