For each 1≤ n ≤∞, we construct an uncountable family of free
ergodic measure preserving actions alpha_t of the free group F_{n}
on the standard probability space (X,µ) such that any two are non orbit
equivalent (in fact, not even stably orbit equivalent). These actions are
all ``rigid'' (in the sense of [Po01]), with the II_1 factors L^∞(X, µ)\rtimes_{alpha_t} F_{n}
mutually non-isomorphic (even non-stably isomorphic) and in the class HT_{s}.