It also accused the Mamata Banerjee government of giving 'encouragement' to the anti-national elements due to its 'Muslim vote bank politics.'
A resolution adopted at the three-day meeting of the Akhil Bharatiya Pratinidhi Sabha (ABPS), the RSS' top policy making body, also condemned the extremist violence.
"This (decline in Hindu population in West Bengal) is a matter of serious concern to the unity and integrity of the country," RSS Joint General Secretary Dattatreya Hosabale told reporters briefing about the deliberations at the meeting.
Hosabale said after partition, the Hindus from East Pakistan were forced to seek refuge in West Bengal.
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It was not surprising that due to such large influx, the Hindu population in the state, which constituted 78.45 per cent in 1951 had declined to 70.54 per cent as per the 2011 census, he said.
The meeting also calls upon the state government to rise above "petty vote-bank politics" and discharge its constitutional obligations, he said.
Listing out several incidents of bomb blasts, arson, violence and "molestation of women" reported in West Bengal in the past few years, Hosabale said the worst sufferers of these atrocities on the Hindu society had been the members of Scheduled Castes.
"The Hindus were subjected to a pre-planned attack resulting in horrid incidents of arson, looting and molestation of womenfolk at Dhulagadh on December 13 and 14, 2016," he said.
On the RSS allegation of increasing attacks on Hindus in
Dubbing the situation in Kerala too as "worrisome," he said that after LDF victory in the assembly elections, there had been sudden increase in the attacks on activists and organisations associated with the RSS.
On the controversy of an RSS functionary offering Rs one crore for the head of Kerala Chief Minister Pinarayi Vijayan, RSS media relations in-charge Manmohan Vaidya said the person had realised his mistake and resigned from his post.
"The RSS does not not support such activities," Hosabale said.
To a question on the choice of a university as the venue for the ABPS meeting at a time when incidents of campus violence across the country was on the rise, he said this was not the first time that such a meeting was held in university campus of the country.
The ABPS meeting, held for the first time in Tamil Nadu, was organised at the Amrita University here.
On selection of Tamil Nadu, particularly Coimbatore, as the venue for the meet, he said the RSS has grown in Tamil Nadu especially in its southern parts.
"It will definitely grow further because of the programmes being organised and we are happy that the RSS is known across Tamil Nadu," Hosabale said.
Around 1,400 elected representatives and the heads of the RSS state units attended the meeting where activities of its various wings were discussed.