Social Engineering.
The BHs were very, very good at it.
Drugs; street drugs, by which they could make unaccounted-for money; money off the books, with which they could bribe officials in every arena of government and agencies.
Prescription drugs, which would further dumb down the masses, along with ever-increasingly bad schools.
Bad food, which would slowly poison the populace, without the people really noticing. Fluoride in toothpaste and foods, which would make the masses gullible.
Heavy advertising, promoting entertainment and consumerism.
Distractions, such as sports events.
How many others can you think of?

Convincing the masses that, “conspiracy theory” is an evil term as opposed to understanding that conspiracy in and of itself is a problem and without a theory it wouldn’t even be investigated without pushback and ridicule.
Swapping, out Lifelog for Facebook to make folks gleefully spy on themselves.
Convincing a large enough group of children that cisgender is bad.
The illusion of choice via a two party voting system.
Socialism and communism being normalized.
H.R. 5736 Smith-Mundt Modernization Act of 2012.
Trump Derangement Addiction.
Definition of ANTIFA.
Climate Change.
Internet of Things being used as surveillance and also pushing marketing and propaganda based on that collection of data.
Defunding the police and forcing ICE agents to unmask.
Convincing the masses that gas and coal are dirty and windmills are good.
The wealthy don’t pay their share of taxes.
Division based on class, race, sex, religion, etc.
Supporting places like Ukraine.
Taxation.