They complain of the people who have joined the party and swelled its ranks to more than 600,000, claiming they're infiltrators or entryists, to use a term they levelled at the Militant Tendency in the 1980s.
But, in reality, Blair and his ilk are the infiltrators, the entryists who took what Labour was all about and turned it into a poor man's Tory party that forgot about the poor man and become "intensely relaxed about the filthy rich", as Peter Mandelson once said.
An obvious one has presented itself - that the chance to register to vote has allowed hard-left entryists
(and even a few Tory mischiefmakers) to sign up to back Mr Corbyn.
It was people like them who in the 1980s chased out Labour's left accusing them of entryism but the Blairites are the entryists
Broadly stated, the divisions of 1953 were accentuated in the United Kingdom, with Pablo-inclined entryists buried so deeply in the Labour Party that there was little public Trotskyism to be associated with them, and the Healy-led SLL caricaturing the position of the SWP in a proletarian separatism that inevitably charted a politics of sectarianism.
Maurice Spector, for instance, opposed the entryist tactic in the United States.
The poem's finale is a conviction without appeal: entryists
of private life are called "rodentia of love," "perverters of feelings.
It was people like them who in the 1980s chased out Labour's left, accusing them of entryism, but the Blairites are the entryists
Ever since the party was hijacked by middle-class entryists
from the Mandelson Tendency in the 90's the party has increasingly neglected working people and fostered the interests of Free-Market Capitalists.
Meanwhile, former Work and ENTRYIST
Ken Loach Pensions Secretary Mr Hain yesterday warned "most party members feel underwhelmed by the choice they have been offered".