Well, I found a copy, and it's dead-on the best thing I've ever read about the Gracchi (the good news). The bad news is - published 1976, it's now out of print, and although I easily found a used copy on Amazon, not sure if I got the last one!

Anyway, please note: Daggers in the Forum - the revolutionary lives and violent deaths of the Gracchus brothers. By Keith Richardson. His analysis of what happened before, during and after the Gracchi is the best I've ever read. We're all used to the potted Gracchi history. Richardson's detail makes it come alive and damned near jump off the page. WHY has no one done more on this incredible decade?

Interestingly, the title comes from Cicero:

"...those daggers which Gaius Gracchus boasted he had flung into the forum for the citizens to fight it out." (Cicero, The Laws, 3.20)

Cicero was, to put it mildly, totally anti-Gracchan, and it's interesting to trace the development of the divisions into populares and optimates. Nothing the Gracchi did, no reform, no idea, no tactic, was ever less, to Cicero, than a total insult and bad influence on the declining Republic. One of the joys of the book is that apparently Richardson has pulled (with cites!) every intelligent quote ever made by any surviving Roman author on the Gracchi, pro and con.