The capital discovery in the career of Alfonso Sastre was the fact that the theatre is a social act, and one which may have far-reaching consequences. The recognition of his role as a kind of social leaven places a heavy responsibility upon the dramatist, for he is capable of directing the thoughts and feelings of large sections of a population. Sastre, facing up squarely to this responsibility in a country where it is not always easy to do so, is producing what he calls a Theatre of Social Agitation whose fundamental theme is Revolution. It is not surprising to find that his plays have enjoyed few performances in Spain, where, however, Sastre is recognized as one of the outstanding young playwrights of today, and more than an author of promise. Of the ten full-length plays written before 1959, only five have been presented in Spain.