Marcus Tucker is a character in “The Blacklist: Conspiracy”.
During his career as a human trafficker, he worked with Floriana Campo. His connection to Floriana Campo may be how Raymond Reddington learned about his operations.
Reddington had followed Tucker's criminal career for a while, until Tucker laid low. Reddington believed he had retired from his disappearance.
He went to school for game design before deciding to get into the social media industry.