Tonight at 8:15 PM and Monday at 8 PM, the Gene Siskel Film Center takes a break from the usual Frankenstein/Nosferatu/Caligari routine to present a little-seen Spanish shocker called Who Can Kill a Child? (1976). It’s been called a lot of other things too—Island of the Damned, Death Is Child’s Play, The Killer’s Playground—but fans of 70s exploitation tend to score movies not with a star rating but by the number of release titles it’s accumulated.