Proletarian Party of East Bengal

The Proletarian Party of East Bengal (Bengali: পূর্ব বাংলার সর্বহারা পার্টি) also known as Purba Banglar Sarbahara Party, commonly referred to as Sarbahara, and abbreviated as PBSP, is a Marxist-Leninist-Maoist communist party in Bangladesh, which aims to overthrow the Bangladeshi state and complete the new democratic revolution through protracted people's war. It was formed by Siraj Sikder on 3 June 1971, in the Barisal district amidst the 1971 liberation war of Bangladesh.

The party started its activities in 1968, as Workers Movement of East Bengal. It played a major role in the independence struggle of the country. From the late 1960s to early 70s, it engaged in armed struggle against the West Pakistani regime, in order to establish a Democratic People's Republic of East Bengal. After the proclamation of Bangladesh led by Mujib–Awami government, the party launched a war against the Bangladeshi state. However, heavy repression from the regime, the murder of then Chairman Siraj Sikder and several internal divisions led to the decline of the party. Despite this, it remains active in several regions of the country and continues to carry out attacks against state police, land owners and extorters.

According to the constitution of the party, the highest body is the Party Congress, which is to be held every five years, but due to it being an underground operation and heavy repression from state forces, the time period has never been maintained. Until now, the Party Congress has been held five times, the first being in 1972 and the last in 2024. Since 1977, Anwar Kabir has been serving as the General Secretary of the party. In the 5th Party Congress, Anwar Kabir was elected as the Chairman of the party. In the early 2000s, two groups broke out of the party and formed the Proletarian Party of East Bengal (Maoist Bolshevik Reorganisation Movement) and the Proletarian Party of East Bengal (Maoist Unity Group).