Marden's tameness conjecture

Let $M$ be a hyperbolic $3$-manifold with finitely generated fundamental group. The interior of a compact manifold with boundary is a topological model for a tame hyperbolic $3$-manifold. Marden's tameness conjecture. The manifold $M$ is homeomorphic to the interior of a compact manifold with boundary. The source says that Agol's proof, together with an independent proof by Calegari and Gabai, settled this conjecture and helped clarify the structure of hyperbolic $3$-manifolds.