Left parties would meet on November one in New Delhi to chalk out a strategy for the purpose, Karat told reporters here.
"We are trying to bring major Left parties and groups together, so that we can have a strengthened unity of Left forces in the country," he said.
He said that consultation with various Left parties were on for the upcoming meeting.
Karat had said recently that the CPI-M would soon form a broad-based platform of Left parties to organise intensive movements in the country to resist the alleged communalisation of politics by the ruling BJP.
"The purpose of the meeting is to forge broader unity among Left forces to jointly fight communal forces," Forward Bloc central committee member Hafiz Ali Sairani told PTI.
At the meeting to be held at CPI-M headquarters on Alimuddin Street, Left parties outside the front - SUCI-C, CRLI headed by the former naxalite leader Ashim Chatterjee, CPI(ML) Liberation and CPI-ML Santosh Rana group and the PDS have been invited.