- Formed – October 21, 1951.
- President – Dr. Syama Prasad Mookerjee.
- 1st Lok Sabha Election – 3 MPs – 3.06% votes share.
- Got national party status.
- Pushed for a coalition of parties in the Parliament.
- National Democratic Front (NDF) – led by – Dr. Mookerjee.
- NDF constituents – BJS + Akali Dal + Gantantra Parishad + Hindu Mahasabha + Tamil Nadu Toilers Party + Commonweal Party + Dravid Kazhagam + Lok Sevak Sangh + Inds.
- NDF – with 38 MPs – 32 Lok Sabha MPs + 6 Rajya Sabha MPs.
- 1st BJS conference – December 29 to 31, 1952 – Kanpur.
- General Secretary – Pt. Deendayal Upadhyaya.
- 1957 Lok Sabha Election – 4 seats – 5.93% vote share.
- 1962 Lok Sabha Election – 14 seats – 6.44% vote share.
- 1967 Lok Sabha Election – 35 seats – 9.41% vote share.
- 1967 – March – 1st non-Congress government in Bihar – BJS was a part of it.
- February 13, 1968 – Atal Bihari Vajpayee – was elected BJS president.
- 1971 Lok Sabha Election – 21 seats –
- 1977 – 3 BJS leaders were part of the Janata Party government.
- Dual membership – merged BJS leaders were also RSS Karyakartas.
- They were asked either to leave Janata Party or RSS.
- Health Minister Raj Narain resigned on dual membership controversy.
- What Raj Narain & others felt. BJP was gaining, consolidating its base. Socialists losing it.
- The merged BJS faction decided to leave Janata Party and its government after this controversy.
- April 6, 1980 – the Bharatiya Janata Party (BJP) was formed.