These past few days have seen some notable cyber justice cases: Late Monday, Alan M. Ralsky — a man dubbed the “Godfather of Spam” — was sentenced to 51 months in prison. And on Friday, a California man pleaded guilty in a case involving the sale of counterfeit high-tech computer parts to the U.S. military. Ralsky, 64, of West Bloomfield, Mich., joined two co-conspirators in earning stiff prison sentences for long careers of blasting junk e-mail. Following more than four years in prison, Ralsky will be subject to five years of supervised release and will forfeit $250,000 the government seized from him in December 2007, the Justice Department said. According to the government, Ralsky was a top promoter of so-called pump-and-dump scams, schemes in which fraudsters buy up a bunch of low-priced microcap stock, blast out millions of spam e-mails touting it as a hot buy and then dump their