The Estate. More specifically, The Morrison Estate.
It’s a powerful Earth-based society unrelated to the government with the sole purpose of protecting Earth from various dangers presented by the existence of the Strange. It is named after Carter Morrison, a man who died defending the Earth from one such a danger, and it is also the company behind a grant called the Morrison Prize, which they give out to scientists in order to curb them away from getting too advanced in the incredibly dangerous field of quantum mechanics.
Known Estate Locations and Agents: