Weaseling your way into an institution that you couldn't possibly
hope to have built yourself simply so you can subvert it for your own personal benefit that are at odds with what built that institution in the first place.
Named after Malcolm Turnbull, the 29th Prime Minister of
Australia, who joined the Australian Liberal
Party even though his political and social views aligned with the Australian Labor
Party. He worked against his leader, undermining Prime Minister Tony Abbott to knife him in the back and take the prime ministership - something he could never have obtained via a general election had he not been the incumbent.
Other examples include the subversion of
long established fandoms such as Star Wars and Doctor Who and how the woke left now push their marxist agenda