Secrataries of undivided Communist Party
1. P. Krishnapillai
2. C. Achuthamenon
3. M.N. Govindan Nair
4. E M S
Secrataries of CPI (M)
1. E M S
2. C. H Kanaran
3. A K G
4. V. S Achuthananthan
5. E. K Nayanar
6. Chadayan Govindan