Adegbenro did not join active politics until the 1940s. It was then that he joined the ranks of Awolowo, Akintola and others in launching the Action Group party in April 1951. The party contested the 1951 elections to the Western Region House of Assembly but lost most of the seats to the National Council of Nigeria and the Cameroons (NCNC) that was led in the Region by Adegoke Adelabu.[5] Though the election results favoured the NCNC, post-elections defections gave the AG the majority.[1]
Adegbenro, notwithstanding, was easily elected because of his popularity in local Egba politics. Not quite long, he was selected by the Regional Assembly as one of its representatives in the Federal House of Representatives in Lagos. He returned to the Western Region House of Assembly in 1954 to serve as Parliamentary Secre to the Minister of Justice and later as Minister of Land and Labour and then Minister of Local Government. He was an able, trusted and articulate administrator. He built an intimate partnership with his party and government leaders, particularly Chief Awolowo who was then Premier of the Region. He was to remain a devoted collaborator of the Chief even when the latter moved unto national plane as Opposition Leader in the Federal House of Representatives.[1]
Following the Action Group Crisis that plunged the Western Nigeria into deep political crisis which subsequently engulfed the whole county, Adegbenro was suspended from office in the ensuing military coup of 1966. He led the Action Group when Awolowo and other leaders of the party were imprisoned.
During the Nigerian Civil War, he was Minister for Trade and Industry. He withdrew from politics in 1971.[4] He died in 1975[1]
