Santosh Singh, son of the Sangh's president R N Singh, had fought on a Shiv Sena ticket against former minister Mohammed Arif Naseem Khan from Chandivali assembly seat in the 2009 polls.
On the matter, which has stoked a controversy in the organisation, its executive president Sharda Prasad Singh and other members have written to Singh seeking an explanation on why he used a non-political organisation to pitch for a particular party.
Sharda Prasad Singh and Jhunjhunwala College trustee Rajendra Singh said Singh had used the sangh to support his son's political career.
Former Minister Chandrakant Tripathi asked Singh to disclose in which meeting was it decided that a public appeal to support a political party would be issued.
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A case related to the affairs of the Uttar Bharatiya Sangh is pending in Bombay High Court. According to the members, the plot for the sangh building was given by the government at concessional rates which was to be used for welfare programmes of the community.