The SNDP, a powerful outfit of the backward Ezhava community in Kerala, said it would back the candidate who helps the community, in the May 28 by-poll to Chengannur assembly constituency.
"The candidate who helps and co-operates with the community will get our votes. We know very well who does so," Sree Narayana Dharma Paripalana Yogam General Secretary Vellapally Natesan said, without elaborating.
The sub-committee of SNDP, formed to work out a strategy for the by-poll, took the decision.
SNDP's position assumes significance as its political wing Bharat Dharma Jana Sena (BDJS), is a partner in the BJP-led NDA in Kerala.
The Nair Service Society, another Hindu group, has also made it clear it would not take sides with any particuler Front in the by-poll.
The outcome of the by-poll is unlikely to have any serious impact on the LDF government as the ruling Front has a huge majority in the assembly.
But the poll result will be widely seen as a referendum on the performance of the LDF government.