In Siberia, Trotsky studied philosophy. He became aware of the differences within the party, which had been decimated by arrests in 1898 and 1899. Some social democrats known as "economists" argued that the party should focus on helping industrial workers improve their lot in life and were not so worried about changing the government. They believed that societal reforms would grow out of the worker's struggle for higher pay and better working conditions. Others argued that overthrowing the monarchy was more important and that a well-organized and disciplined revolutionary party was essential. The latter position was expressed by the London-based newspaper "Iskra," ("The Spark,") which was founded in 1900. Trotsky quickly sided with the "Iskra" position and began writing for the paper.