The Executioner Series by Don Pendleton

The mafia destroyed his family after driving them to the depths of degradation and depair. Now Mack Bolan has returned from the jungles of 'Nam, burning with one insatiable desire: revenge! The Special Forces' top assassin has declared war on the cancerous leeches that are draining America's lifeblood. The underworld may have the numbers - but they're no match for his brutal, devastating fury. He is Mack Bolan, the Executioner!

Mission Unthinkable. . .Long live the king, the king is dead. Augie Marinello, Boss of All the Bosses, has paid the final tab to the Executioner. But from the ashes of Augies defeat is rising a new and stronger syndicate - better than ever. The big "if" seems to be David Eritrea, formly chief advisor to the dead king, now heir presumptive to the Marinello throne... moreMission Unthinkable. . .Long live the king, the king is dead. Augie Marinello, Boss of All the Bosses, has paid the final tab to the Executioner. But from the ashes of Augies defeat is rising a new and stronger syndicate - better than ever. The big "if" seems to be David Eritrea, formly chief advisor to the dead king, now heir presumptive to the Marinello throne. Eritrea is trying to rally the Five Families of New York to his banner, to radically reoganize the entire New York crime structure and establish himself as the Boss of New York. From that position, Eritrea can control La Commissione and forge a new coalition of international underworld power. The only question seems to be whether Eritrea has "legs enough" to take over New York. It is a situation tailor-made for Bolan. The ironic part is that Bolan himself was the tailor. He actually helped the fledgling Eritrea to his feet and gave him the push to get him started toward the throne. Now he has to cut the legs out from under the guy. . . but how? less