Topological Fundamental Groupoid. II. An action category of the fundamental groupoid

For a path connected, locally path connected and semilocally simply connected space $X$, let ${\mathrm{\Pi }}_1(X)$ denote its topologised fundamental groupoid as established in the first article of this series. Let $\mathcal{E}$ be the category of ${\mathrm{\Pi }}_1(X)$-spaces in which the momentum maps are local homeomorphisms. We show that this category is isomorphic to that of covering spaces of $X$. Using this, we give different characterisations for free or proper actions of the fundamental groupoid in $\mathcal{E}$.