Entryism (or entrism or enterism) is a political tactic by which an organisation or state encourages its members or agents to infiltrate another organisation in an attempt to gain recruits, or take over entirely.
Suggested Target: The Sierra Club
Why: Historically (i.e. before the 90s, the Sierra club has been against immigration in general, both legal and illegal. Among their favorite equations is Impact = Population * Affluence * Technology after all.
So there's no fundamental reason why it couldn't and shouldn't be restored to that track, which is congruent with the retention of demographic hegemony in the US for those of Euro extraction. When last put to a vote, the results were 60-40 percent against with a full-scale and legally questionable mobilization by the directors back around 2004. Control over the directors is a simple matter of votes. Record high turnout for said organization was around 22%, organizational size is around 1.4 million, so subversion is an achievable goal, particularly if executed rapidly before a counter mobilization can be made against it. And, membership is on sale right now, $15 instead of the usual $25. In addition, the organization appears to be pretty heavily demoralized right now, if you read between the lines on their website. Being able to consistently say that 'The Sierra Club' supports a moratorium on immigration and Operation Wetback II, the sequel, would give cover to a lot of people who are afraid of being painted as racists. This is why back in 2004 The Powers that Be were so terrified of the attempted internal coup at the Sierra Club elections. But said coup was just mobilizing people already inside who agreed with Tanton et al. Combine it with a hefty load of entryism and a second effort should succeed pretty easily. Ideally, the entryists would be very 'old school' conservative/reactionary environmentalists who'd maintain the brand.