  The aim of this paper is to prove the following result: Let $\pi$ be a set of
odd primes. If the group $G=AB$ is the product of two $\pi$-decomposable
subgroups $A=A_\pi \times A_{\pi'}$ and $B=B_\pi \times B_{\pi'}$, then $G$ has
a unique conjugacy class of Hall $\pi$-subgroups, and any $\pi$-subgroup is
contained in a Hall $\pi$-subgroup (i.e. $G$ satisfies property $D_{\pi}$).

Group Theory