Who is this Abani Roy and who cares about the REvolutionary Socialist Party? These are minor politicians from West Bengal who have survived by hanging on to the coat-tails of the CPI-M. Now that the CPI-M itself is in the dock, these petty people want to keep their options open. However, they will live or die with the CPI-M.
There is another such party in West Bengal called the Socialist Unity Centre of India. They are also just a nuisance.