Marcin Kasprzak

Marcin Kasprzak (November 2, 1860 – December 8, 1905) was a Polish Marxist revolutionary and a prominent leader of Poland's labour movement. He was a member of the Socialist Workers' Party of Germany (SAP), the International Social Revolutionary Party "Proletariat" (usually referred to by the names First Proletariat or Great Proletariat party), the Polish Socialist Party in Prussia, and the Social Democracy of the Kingdom of Poland and Lithuania (SDKPiL) party, and was a founder of the Social Revolutionary Party "Proletariat" (usually referred to by the names Second Proletariat or Small Proletariat party).

Biography Kasprzak was born the son of a laborer on November 2, 1860, in the village of Schmiedsruh, Kreis Schrimm. In 1885 he moved to Berlin and joined the SAP. He soon returned to his homeland, where he joined the First Proletariat.

Kasprzak was arrested in 1885, but escaped prison in 1887 and fled to Switzerland, then illegally arrived in Warsaw the same year. After the destruction of the First Proletariat in 1888, Kasprzak became one of the founders and leaders of the Second Proletariat.