you are right... but when he has become a constitutional entity, beyond party lines, then what is wrong in the party expelling mr chatterjee...
before the trust vote, the party might have send message to mr chatterjee to get back to the party at a time when it required him on its side... which he didnt want to...
so the party waited till the time he discharges his duties as speaker during the trust vote and the next day expelled him...
it is absolutely internal matter with CPI(M) and nothing wrong in that...
