Infiltration from bangldesh,issuing identity cards of citizenship to illegitimate muslim immigrants of bangldesh,setting up of hundreds of illegal madrasas and maktabs which brainwashes the muslims to make them involved in terrorism and other illegal activities happened in cpim ruling and these communists were inactive (still now they are) due to their valuable minority votebank,specifically the muslim votebank.
The same party which organises rally against the attack on iraq ,gujarat riot is mum about the tortures and crimes done on hindu minorities in bangladesh,pakistan and other muslim countries