One of my favorites, so much so that I'm presenting the full wraparound cover by Ross Andru and Dick Giordano. As a kid, I was a sucker for any collection of classic JLA stories--heck, I still am.
This book collects a great three-part JLA/JSA crossover, also starring the (then) forgotten Seven Soldiers of Victory, from Justice League of America #s 100-102 by Len Wein, workhorse Dick Dillin, Joe Giella, and Dick Giordano. The stories--"The Unknown Soldier of Victory", "The Hand That Shook the World", and "And One Of Us Must Die!" involve the JLA and JSA celebrating the JLA's "100th meeting" (nice tying it in to the 100th issue, Len!) when Dr.Fate, who knows his business, tells the assembled heroes of a bad guy named The Iron Hand who's planning on destroying Earth 2.
The story then connects back to old cases handled by the Seven Soldiers of Victory, so the heroes break up into teams(of course!) to head into different dimensions to set things right. It's here they meet up with the "forgotten" heroes, like The Crimson Avenger, the Star-Spangled Kid and Stripsey, the Earth-2 Green Arrow and Speedy, the Vigilante, and the Shining Knight.
It's one of those epic adventures that was the JLA's stock in trade, and it's great to have it all collected here. Somehow Dick Dillin managed to draw a story starring approximately one thousand characters (not only does it have the three teams, but Wein threw in Metamorpho, The Elongated Man(not yet a JLA member), and Zatanna!) and not go completely insane.
As a bonus feature, also included is "Triumph of the Tornado Tyrant", from JLA #17, by Gardner Fox, Mike Sekowsky, and Bernard Sachs, which ties in nicely to the significant role The Red Tornado plays in the earlier three-parter.
The inside back cover features an ad for JLA #192, also prominently featuring The Red Tornado(kismet!), and features a gorgeous George Perez cover. Great Guardians, this one of the best DC digests ever!