The Vigil is a supernaturaly aware orginization opperating in New York City.
They first appeared in Deathwish, and are implied to be largely responsible for keeping the supernatural world hidden.
Their tasks include: acting as supernatural janitors and eliminating large threats.
They were present for the destruction of the Auphe, and have demonstrated the financial resources necessary to procure a nuke and heavy artillary.
Samuel is a member. Membership, is implied, to be an offer that you don't refuse.