The line after that contains "conspirators known and unknown". So, the US SDNY has already decided to charge some people. And the US SDNY is going to charge some other people, but they are not aware of their identity.
RICO is for using underlings to charge the boss. In this case, the boss is being charged. Conspiracy charges here imply co-conspirators.
RICO is for using underlings to charge the boss. In this case, the boss is being charged. Conspiracy charges here imply co-conspirators.