Justice League of America #61

That striking black-background cover by Mike Sekowsky and Jack Abel says it all: a mosaic of costumed heroes and grim-faced villains crowd the frame so tightly that — just as the tagline warns — you genuinely can't tell the good guys from the bad. The Flash, Green Lantern, Batman, and several of their fellow Leaguers are cheek-by-jowl with menacing civilian faces, each pair split down the middle to blur the line between champion and criminal. Gardner Fox's "Operation: Jail the Justice League!" promises the kind of twisty, who's-framing-who intrigue that made the Silver Age JLA such a treat in 1968.