Agreed, the wiretaps in the Commission Case and the rats in the concrete club case did much, much more damage.

I remember reading somewhere that Brasco's wire got probable cause for wiring some of the bosses for the commission case, anybody sure about that?

I think that Valachi, for what he personally knew is overrated, it's still disputed about how much of his testimony was his and how much of it was fed to him by the FBI through information through thoroughly illegal FBI wiretaps they couldn't present in any court without blowing the cover on their "black bag" jobs.

But there's no doubt that Valachi's testimony, concocted by the FBI or not, can rank up there as the most damaging.