which political party was he associated with?
Indian National Congress Party in the Indian independence movement and Janata Party as a candidate for Parliament.
Introduction
Beginning a long political career with the Indian National Congress Party in the Indian independence movement, he went on to hold several key offices in independent India—as the first Chief Minister of Andhra Pradesh, a two-time Speaker of the Lok Sabha and a Union Minister—before becoming the youngest-ever Indian president.

who was the first president of india to be elected unopposed Neelam Sanjiva Reddy was he involved in freedom struggle? Yes, he joined the Indian struggle for independence. which other political posts did he have? President of the Indian National Congress, Union Minister of Steel and Mines, Union Minister of Transport, Civil Aviation, Shipping and Tourism, speaker of the Lok Sabha, etc.
Indian National Congress Party Indian National Congress The Indian National Congress Party .
Neelam Sanjiva Reddy Neelam Sanjiva Reddy Neelam Sanjiva Reddy
Introduction Congress President (1960–62) and Union Minister (1964–67) Introduction
Neelam Sanjiva Reddy (19 May 1913 – 1 June 1996) was the sixth President of India, serving from 1977 to 1982. Beginning a long political career with the Indian National Congress Party in the Indian independence movement Reddy served thrice as President of the Indian National Congress  Beginning a long political career with the Indian National Congress Party in the Indian independence movement, he went on to hold several key offices in independent India—as the first Chief Minister of Andhra Pradesh, a two-time Speaker of the Lok Sabha and a Union Minister—before becoming the youngest-ever Indian president.
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Neelam Sanjiva Reddy [SEP] Introduction
As president, Reddy worked with Prime Ministers Morarji Desai, Charan Singh and Indira Gandhi. Reddy was succeeded by Giani Zail Singh in 1982 and he retired to his farm in Anantapur. He died in 1996 and his "samadhi" is at Kalpally Burial Ground, Bangalore. In 2013, the Government of Andhra Pradesh commemorated Reddy's birth centenary.