Vaiko's Marumalarchi Dravida Munnetra Kazhagam (MDMK) on Tuesday parted ways with the People's Welfare Front (PWF).
The PWF was formed a little ahead of the 2016 assembly elections to jointly fight Hindutva, violence against Dalits and minorities and privatisation.
The MDMK had formed the alliance with CPI (M), CPI and VCK last year.
The alliance has been unable to keep itself together after the elections in May.
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