Existence, Uniqueness & Bifurcations · Superchallenge problem

A population with a strong Allee effect and constant harvesting obeys $y' = y(y - 1)(3 - y) - h$. For small $h \ge 0$ there is a stable equilibrium above $1$. Find the critical harvest $h_c$ at which it disappears. Give your answer in simplest radical form.