Just to clarify. "Entryism" is the tactic of joining a mainstream party in the hope of influencing the political process as a whole by influencing that party. "Reformism" is the belief that the status quo is essentially OK, as long as we tinker with it a bit to get rid of the worst excesses of injustice.
The opposite of Reformism is the belief that what is needed is radical or revolutionary change to something different.
So in a sense, electing radical and revolutionary MPs to parliament is in itself an entryist tactic. That's how I understand the terms.
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