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It had been precisely the sort of game that had been anticipated: breathless and absorbing and electric, full of all those flourishes, ideas and experiments that English soccer once would have seen as heresy, a sort of alien entryism, but which are now — thanks in no small part to Guardiola and Bielsa — considered cutting-edge.

In 2015 and 2016, the two Labour leadership contests in which Jeremy Corbyn ran, much was made about the "entryism" or programme of enlisting new members to vote for the left-wing candidate.

The move comes as MPs, including some in government, warn that they believe entryism by pro-Brexit supporters at local Conservative associations risks delivering a leader willing to back a hard break with the EU.

This shift to the right has been exacerbated by blatant entryism.

But there were claims that the new rules were fuelling "entryism" - allowing other groups to infiltrate the party in an effort to promote their own agenda.