Question: What political group did Batukeshwar Dutt and Bhagat Singh belong to?

Context paragraphs:
Batukeshwar Dutt: Batukeshwar Dutt    was an Indian revolutionary and independence fighter in the early 1900s.  He is best known for having exploded a few bombs, along with Bhagat Singh, in the Central Legislative Assembly in New Delhi on 8 April 1929.  After they were arrested, tried and imprisoned for life, he and Bhagat Singh initiated a historic hunger strike protesting against the abusive treatment of Indian political prisoners, and eventually secured some rights for them.  He was also a member of the Hindustan Socialist Republican Association.

23rd March 1931: Shaheed: 23rd March 1931: Shaheed is a 2002 Indian Hindi historical biographical film about Bhagat Singh, directed by Guddu Dhanoa which depicts the events leading up to the hanging of Indian freedom fighter Bhagat Singh and his companions Rajguru and Sukhdev on 23 March 1931.  The film stars Bobby Deol as Bhagat Singh, his elder brother Sunny Deol as Chandrashekhar Azad and Amrita Singh in her comeback role as Bhagat Singh's mother.  Aishwarya Rai has a special appearance in a song.

Shaheed Bhagat Singh Stadium: Shaheed Bhagat Singh Stadium or Nehru Park is a multi-purpose stadium in Ferozpur, Punjab.  The stadium is mainly used for field hockey and has see many Indian greats like Major Dhyan Chand, Gurinder Singh, Jograj Singh, Surjit Singh, and Bhagwant Singh played on this ground.  The stadium was previously known as Nehru Park but later was renamed after Shaheed Bhagat Singh.

Shaheed Bhagat Singh State Technical Campus: Shaheed Bhagat Singh State Technical Campus (formerly known as Shaheed Bhagat Singh College of Engineering and Technology) is an Integrated Technical Campus in the Ferozepur city of Punjab.  It was established by Punjab Government in the year 1995.  Dr.Tejinder Singh Sidhu is the current director.  The institute is fully promoted by the Punjab Government and is registered as a Society under the Societies Registration Act 1860.  Only merit based admission is available.Students with jee main qualification get admission here.It is considered as one of the best engineering college in terms of infrastructure and studies in north India.  Now the college is autonomous and affiliated to Maharaja ranjit Singh state technical university.

Shaheed-E-Azam: Shaahed-E-Azam is a 2002 Hindi film directed by Sukumar Nair.  The film, based upon the life of Shaheed Bhagat Singh, caused some controversy as the Punjab and Haryana High Court issued a notice to the producers calling for a ban of the movie.It was released in 2002.  In the same year two other movies on Bhagat Singh were also released named "" and "The Legend of Bhagat Singh".

Thakur Ram Singh (revolutionary): Thakur Ram Singh (1911–2009) was an Indian Communist Revolutionary and associate of Bhagat Singh.  He started his political life as a congress activist but was attracted towards the ideals of Bhagat Singh and his Hindustan Socialist Republican Army.  Thakur Ram singh was sentenced to life imprisonment in Andaman Nicobar's Cellular Jail for his role in Dogra Shooting case of Ajmer.  Inside the jail he has formed a 'Communist Bloc' and lateron after his release from the Andaman's he had joined the Communist Party of India and during the days of Sino-Indian War he had supported the split in the communist movement and was the founder member of the Communist Party of India (Marxist) Uttar Pradesh Committee.

Ansh: The Deadly Part: This story is about Deputy Superintendent of Police Bhagat Pandey (Om Puri), who is thorough, honest, and has an excellent track record of apprehending criminals.This story is about Deputy Superintendent of Police Bhagat Pandey (Om Puri), who is thorough, honest, and has an excellent track record of apprehending criminals.  This background creates problems for him with other criminals who are closely connected to powerful politicians.  As a result he is transferred to Bombay (now known as Mumbai).  He takes charge of his post, and transforms everything to a diligent and honest policing machine.  Unfortunately, politicians and criminals alike do not like his diligence, and talk about transferring him to Kashmir, where he will be killed in an encounter by a terrorist.  Bhagat also comes in touch with suspended Police Inspector Sukhdev Singh, and gangleader, Rajnath Guru, the son of a freedom-fighter, Dinanathji (Aloknath).  A truly moving movie depicting characters from India's freedom struggle against the British, Raj Guru, Bhagat Singh, and Sukhdev Singh were the ones who fought for freedom again the British, in this kalyuga, the three Rajnath Guru, Bhagat Pandey, and Sukhdev Singh must fight against corruption and their very own lives.

The Legend of Bhagat Singh: The Legend of Bhagat Singh is a 2002 Indian historical biographical film about Bhagat Singh, a freedom fighter who fought for Indian independence.  It was directed by Rajkumar Santoshi and starred Ajay Devgan, Sushant Singh, and D. Santosh.  It was released on 7 June 2002 and went on to win two National Film Awards, including the National Film Award for Best Feature Film in Hindi, and three Filmfare Awards, including the Filmfare Critics Award for Best Movie.

Bhagat Singh: Bhagat Singh (] 1907  – 23 March 1931) was a charismatic Indian socialist revolutionary whose two acts of dramatic violence against the British in India and execution at age 23 made him a folk hero of the Indian independence movement.

Garhi Ajit Singh: Garhi Ajit Singh (Punjabi: ਗੜੀ ਅਜੀਤ ਸਿੰਘ ) is a village in Shaheed Bhagat Singh Nagar district of Punjab State, India.  It is located 5.2 km away from postal head office Aur, 17 km from Nawanshahr, 8.4 km from district headquarter Shaheed Bhagat Singh Nagar and 106 km from state capital Chandigarh.  The village is administrated by Sarpanch an elected representative of the village.

Supporting paragraphs: Batukeshwar Dutt Bhagat Singh
Answer: Hindustan Socialist Republican Association