With the Green Party and Reform UK facing claims that they're providing a home for extremists from far left and far right, the political masterminds are looking at how to deal with entryists.
Danny argues that the most important decision a political party can make is about who it won't let in, and Sally recalls fighting Labour's long battle against the Militant faction in the 1980s.
We also reflect on the failed coup against Sir Ed Davey, and ask whether there's another political strategy available to anyone who might have designs on replacing him.
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Video Editor: Kim McCarthy
Executive Producer: Andrew Alexander
Picture: Getty Images
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