Anarchism in Poland first developed at the turn of the 20th century under the influence of anarchist ideas from Western Europe and from Russia. Prior to Polish independence from the Russian Empire, several anarchist organizations emerged within the area that would become the Second Polish Republic. The first of these, known as "The Struggle", formed in Białystok in 1903. In the following years similar organizations established themselves in Gniezno, Warsaw, Łódź, Siedlce, Częstochowa, Kielce, and other towns. One of the most active, a group known as "International", had its base in Warsaw. This group, composed of Jewish workers, organized strikes throughout the city during the Polish insurrection of 1905.