The Bolshevik Samasamaja Party was the Ceylon section Bolshevik-Leninist Party of India, Ceylon and Burma (BLPI) after 1945 and of the Fourth International in 1948-1950, after the dissolution of the BLPI. The relation between the two groups was often antagonistic. The BSP, which concentrated on building a cadre party, accused LSSP of 'organisational Menshevism'. The LSSP wanted to build a mass-based party and accused the BSP of being introvert doctrinaires. On 25 October 1945 fist-fights broke out between the two groups at a meeting of the BSP.