Mani was administered the oath of office and secrecy by Kerala Governor P Sathasivam at a simple ceremony at the Raj Bhavan here.
The newly inducted Mani was given the Power portfolio while Kadakampally Surendran, who was handling Power, was given Tourism, Co-operation, along with Devaswom.
K C Moideen, who was holding Co-operation and Tourism portfolio, will be the new minister for Industries, Sports and Commerce, a notification issued by the Governor said.
Born at Kidangur in Kottayam district on December 12, 1944, Mani came to Idukki along with his parents.
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It was a struggle for the family and young Mani was forced to discontinue his studies and work as a labourer to help his family. He functioned as CPI(M)'s Idukki district secretary for over two decades.
Mani's induction in the cabinet was to fill the vacancy left by E P Jayarajan, who resigned from the cabinet following allegations of nepotism after he reportedly appointed his close relatives to top positions of state PSUs.
The marxist party had on Sunday recommended Mani's induction in the state cabinet. A popular leader, Mani was instrumental in setting up trade union movements in many plantations to enable workers get their just dues.
Mani had stirred a controversy by his 'one, two, three' speech in 2015 in which he publicly stated that CPI(M) had often eliminated its political foes in Idukki district in the 1980s, following which police registered a case against him for murder and other charges.
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