Flint Marko was the Crime Master's henchmen who earned the name the "Sandman" for brutally killing his victims with his fists.
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History
Marko was affiliated in transporting African-American minorities to Ellis Island for Dr. Otto Octavius' experiments. He was later among Crime Master's men of fighting the Spider-Man, in which Marko showed that he was practically resilient from the vigilante's blows. Marko proceeded to savagely beat up a subdued Spider-Man before being stopped and shot by federal agent Jean De Wolfe. This didn't immediately kill Marko until being gun down repeatedly by Wolfe and his men, which they completely emptied their entire bullets on him.