I am hardly an authority on these matters. However, this would seem to be a rather unfair characterization of anybody unless they actively defend Stalinist like policies or Stalin as a historical figure; or are active members of some sect that does so. And I don't think the CP-USA or Davis did so after Khrushchev.
Perhaps we need other more general descriptive categories for these things? Like "authoritarian state socialist" or something like that? I guess "Stalinist" is a simpler stand in for a phrase like that regardless of how imprecise it is.
Sheldon
-- http://left-wingwacko.blogspot.com/