[2] Upadhyaya started the monthly publication Rashtra Dharma, broadly meaning 'National Duties', in the 1940s to spread the ideals of Hindutva revival.

[3] Upadhyaya is known for drafting Jan Sangh's official political doctrine, Integral humanism,[1] by including some cultural-nationalism values and his agreement with several Gandhian socialist principles such as sarvodaya (progress of all) and swadeshi (self-sufficiency).

[12] Upadhyaya had come into contact with the RSS through a classmate, Baluji Mahashabde, while studying at Sanatan Dharma College in 1937.

[13] Upadhyaya started the monthly Rashtra Dharma publication from Lucknow in the 1940s, using it to spread Hindutva ideology.

[14] In 1951, when Syama Prasad Mookerjee founded the BJS, Deendayal was seconded to the party by the RSS, tasked with moulding it into a genuine member of the Sangh Parivar.

The Jan Sangh also went onto be a part of the Samyukta Vidhayak Dal, an experiment of having non-Congress opposition parties as a coalition to form governments in multiple states This brought the right and the left of the Indian political spectrum on one single platform.

His presidential speech in that session focused on multiple aspects right from the formation of coalition government to language.

[16] No major events happened in the party during his tenure as the president that ended in 2 months in February 1968 due to his untimely death.

[17] Integral humanism was a set of concepts drafted by Upadhyaya as a political program and adopted in 1965 as the official doctrine of the Jan Sangh.

[19] A passenger travelling in the cabin adjoining Upadhyaya's reported seeing a man removing files and bedding from it.

[17] According to the CBI, the men stated that Upadhyaya had caught them attempting to steal his bag and threatened to call the police, so they pushed him from the train.

[21] According to Chandrachud, the CBI's investigation had produced an accurate picture of the death as a spontaneous incident resulting from an interrupted theft.

In August 2017, the BJP state government in UP proposed renaming of Mughalsarai station in honour of Upadhyaya as his dead body was found near it.