The leaders condemned the move against K Rajasekharan, and decided to fight the "politically motivated" case.
Police had booked Rajasekharan on May 16 on charges of spreading a false report over the killing of the Sangh man at Payannur last week.
He was hacked to death on May 12, allegedly by CPI(M) workers in Kannur, which has witnessed a series of clashes between the ruling party and RSS for the past one year.
Talking to reporters after the meeting, Rajasekharan said BJP and its alliance partners would jointly organise various agitations at panchayats and state-level next week to "expose the wrongdoings" of the LDF government, which is completing its one year in power in the state.
He rejected Chief Minister Pinarayi Vijayan's claim that there was no corruption charge against the government.
"It is a corrupt government," he said, referring to circumstances which forced CPI(M) leader E P Jayarajan to quit following charges of nepotism.
"It was a year of bad governance in Kerala. The LDF government has failed in all sectors. Prices of essential commodities are shooting up. The number of political killings has increased. Nineteen people lost their lives in political violence after LDF government came to power," he said.
He said BJP chief Amit Shah would undertake a three-day Kerala tour from June 2 as part of the party's preparations for the 2019 general elections.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)