Slums are usually the result of government restricting or failing to build enough housing (of the right kind) which forces people to build their own permanent housing without any permits at all. Because slum residents have to pay for the entire building upfront and build it themselves you can expect the quality of the buildings to be very low.
There are slums in San Francisco. Those so called "tent cities". You get rid of slums by fulfilling housing demand.
Your conspiracy theory makes no sense at all. The role of a government, if any, is to stop people from building shanty towns. That's what building regulation does: stop anyone from building sub-par housing. It makes absolutely no sense to claim that slums pop up because a government stops people from building slums.