  The Hall conductivity in the magnetic-field-induced spin-density-wave (FISDW)
state of the quasi-one-dimensional organic conductors (TMTSF)$_2$X at a finite
temperature is calculated. The temperature dependence of the Hall conductivity
is found to be the same as the temperature dependence of the Fr\"ohlich current
of a regular charge/spin-density wave. Predicted dependence $\sigma_{xy}(T)$
can be verified experimentally in the (TMTSF)$_2$X compounds if all components
of the resistivity tensor are measured and the conductivity tensor is
reconstructed.
