Following Zion Elcher

Leonid is not actually the name of the leader of the organized crime group. That's what they came to realize after a few days of watching and rewatching the footage of the auction combining it with what Mason learned and heard from while he was at the auction. 

Leonid is the name of the group. 

After days of research, they found out that Leonid used to be a section of one of the most infamous criminal groups in history that was founded a century ago. They were called Deabru.