ISF was formed ahead of the
West Bengal Assembly election of 2021 and joined the
Sanjukta Morcha, led by the
Left Front and the
Indian National Congress It contested the 2021 West Bengal Legislative Assembly election in 32 seats and won in 1 seat. The party fought the election under the borrowed symbol of Rashtriya Secular Majlis Party, a
Bihar-based political party. Afterwards, ahead of
2026 West Bengal Legislative Assembly election, ISF again joined the alliance led by CPI(M)-led
Left Front. Subsequently, ISF retained its common election symbol under the revised
ECI criteria ahead of the polls. In 2026 West Bengal Legislative Assembly election, ISF won 1 seat out of 29 it contested. == Electoral performance ==