Question: Siddhartha Bhattacharya is a member of a political party with close links to what Hindu nationalist?

Context paragraphs:
Assassination of Mahatma Gandhi: Mahatma Gandhi was assassinated on 30 January 1948 in the compound of Birla House (now Gandhi Smriti), a large mansion in central New Delhi.  His assassin was Nathuram Vinayak Godse, a Chitpavan brahmin from Pune, Maharashtra, a Hindu nationalist, a member of the political party, the Hindu Mahasabha, as well as a former member of the Rashtriya Swayamsevak Sangh (RSS), a right-wing Hindu paramilitary volunteer organization.  Godse had planned the assassination with other Hindus from various backgrounds including a refugee from the Partition of India and Pakistan in 1947.

Hindu American Foundation: The Hindu American Foundation (HAF, founded September 3, 2003) is a Hindu advocacy group operating in the United States.  It presents itself as a human rights organization, providing a voice for the Hindu American community.  It publishes annual surveys of human rights of Hindus in South Asia and overseas.  The organisation has links to the Hindu nationalist organisations Vishva Hindu Parishad and Hindu Swayamsevak Sangh.  It was involved in the California textbook controversy over Hindu history.

Bharatiya Janata Party: The Bharatiya Janata Party (] ; translation: Indian People's Party; BJP) is one of the two major political parties in India, along with the Indian National Congress.  s of 2016 , it is the country's largest political party in terms of representation in the national parliament and state assemblies, and it is the world's largest party in terms of primary membership.  The BJP is a right-wing party, with close ideological and organisational links to the Hindu nationalist Rashtriya Swayamsevak Sangh.

Hindu Prajatantrik Party: Hindu Prajatantrik Party is the Hindu nationalist political party in Nepal.  The goal of this party is to strive to establish Nepal as a Hindu republic.

Socialist Party of Transylvania: The Socialist Party of Transylvania was a political party in Romania, active primarily in Transylvania.  Born out of the ethnic Romanian section of the Social Democratic Party of Hungary (MSZDP), it gradually attracted other socialist and social-democratic groups active in the Transleithanian lands of Austro-Hungary incorporated into the Kingdom of Romania after World War I.  Although initially it claimed, under the title Social Democratic Party of Transylvania and Banat, the adherence of the MSZDP party sections in Banat, the latter, while maintaining close links with the Transylvania party, constituted themselves as a distinct political organization.  The party also actively sought the cooperation of the socialist parties active in other regions of Romania, working towards a unified political party of the working class.  Such plans were however soon thwarted by repression from the part of the Romanian authorities, as well as disagreements both inside the party and among the different socialist formations of Romania.  The disagreements were further aggravated by the request of the Third International that the leaders of the party that had collaborated with the Romanian National Party be excluded from the merger, and eventually resulted in the split between the reformist social-democrats and the revolutionary-minded communists.  While the former decided to retire from unification talks and re-establish an independent Transyvanian party, the latter joined the majority of Socialist Party of Romania (PSR) to create the Communist Party of Romania in May 1921.  The social-democratic faction would late join the PSR members that disagreed with the new orientation of their party, founding the Romanian Social Democratic Party in 1927.

Siddhartha Bhattacharya: Siddhartha Bhattacharya is an Assamese Politician from the state of Assam.  He is a member of the Assam Legislative Assembly from Bharatiya Janata Party.  He had joined Bharatiya Janata Party in 1995 and was party President of Assam unit in 2014 but was replaced by Sarbananda Sonowal ahead of Assam Legislative Assembly election, 2016.

Akhil Bharatiya Hindu Mahasabha: The Akhil Bhāratiya Hindū Mahāsabhā (translation: "All-India Hindu Grand-Assembly") is a right wing Hindu nationalist political party in India.

Balraj Madhok: Balraj Madhok (25 February 1920 – 2 May 2016) was an Indian political activist and politician from Jammu.  Originally an activist of the Hindu nationalist organisation Rashtriya Swayamsevak Sangh (RSS), he later worked as a politician in the Bharatiya Jan Sangh (BJS).  Madhok was instrumental in launching the RSS in the princely state of Jammu and Kashmir and later the political party Jammu Praja Parishad for representing the interests of Jammu Hindus.  He eventually rose to become the president of the Bharatiya Jana Sangh and led its successful contest in the general election of 1967.  He resigned from the party afterwards due to political differences with Atal Bihari Vajpayee and L. K. Advani.

Hindu Sena: Hindu Sena (IAST: Hindu Sēnā) (translation; "Army of Hindus"), also known by the name Sena, is an Indian Non-profit organization.  Its ideology is based on pro-Hindu ideology and Hindu nationalism (Hindutva), founded on 10 August 2011 by Vishnu Gupta, who is also its current leader.  The organization originally emerged from a movement in New Delhi demanding equal treatment for Hindus.  Members of Hindu Sena are referred to as Hindu sainiks.  Although the organization's primary base is still in New Delhi, it has tried to expand to a PAN-India base.  In the 2010, it gradually moved from advocating a pro-Hindu ideology to one supporting a broader Hindu nationalist agenda, as it refused to be aligned itself with the Bharatiya Janata Party.  The organization started taking part in center politics since its inception.

Tunisian nationalism: Tunisian nationalism refers to the nationalism of Tunisians and Tunisian culture.  Tunisian nationalism's origins stretch back to the 19th century; however, Tunisian nationalism became a significant political force after 1908 with the founding of the Young Tunisians movement, and the more significant Destour (Arabic for "Constitution) Party established after World War I.  The Destour Party called for Tunisian autonomy within the French Empire and that France should not dominate Tunisia's politics and society.  France responded by banning the Destour Party in 1933, resulting in the rise of a more radical nationalist party, the Neo-Destour Party being formed in 1934 led by Habib Bourguiba.  The Neo-Destour Party demanded independence of Tunisia from France, though it respected French and Western culture and sought to maintain close links with France after independence was achieved.

Supporting paragraphs: Siddhartha Bhattacharya Bharatiya Janata Party
Answer: Rashtriya Swayamsevak Sangh