Union minister Nitin Gadkari told reporters after meeting the President that BJP and RSS workers were facing "atrocities" from CPI(M), which led the alliance that won the Assembly polls in the state.
He alleged that police was not taking appropriate action.
"We have given the President details of these cases, including photographs. Our worker Pramod was killed. Houses of more than 100 workers have been vandalised. Situation is not good. He has assured us that he will take appropriate action.
Asked about CPI(M)'s charge that BJP was misleading, he said details of the incidents have been submitted to Mukherjee.
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Besides Gadkari, the delegation included Union ministers J P Nadda, Nirmala Sitharaman and Rajiv Pratap Rudy, MPs Meenakshi Lekhi and M J Akbar and Kerala BJP President Kummanam Rajasekharan.
Attacking the Left Front, BJP chief Amit Shah had yesterday accused it of "violating" the people's mandate as his party said it will not sit quiet and fight on the streets if violence continues.
The delegation claimed that "enhanced presence" of the BJP in the state, converting bipolar election to a visible tripolar, has given the Left parties a reason to scale the level of violence.
"There is the general apprehension that the state may witness a large scale organised crusade by the Left front government to decimate the growing strength of BJP through violent means," the memorandum submitted by the delegation said.
The delegation said this incident in particular is one of the few cases of post election violence "unleashed by the incumbent LDF government".
"There has been a history of over 100 activists, 'karyakartas' of the BJP and the RSS, who have been brutally killed and many more injured and maimed for pursuing their nationalist ideological commitment where majority of such cases of attack and killing have proven to have been unleashed by the Left front workers," it alleged.
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The memorandum said with the Left Front assuming power there are visible signs of large scale violence being escalated against the BJP workers.
"BJP would like to draw the kind attention of the Honourable President to the extreme lawlessness prevailing in the state of Kerala which has witnessed manifold increase in violence post May 16 State assembly polls.