It sounds like you've completed the Acts of Infamy for Nigel Ewing, Armand Krishnan, Marvin de Luca, and Lei Ying Lo. If you have, and you've built the Inner Sanctum room and placed the Conference Table in it, they should be sitting around the table, waiting for you to finish up. If you haven't built the Sanctum or the Table, the crime lords will mill about like tourists until you do.
Nothing further happens with these guys until you've dealt with Nikita and Bob.
Nikita Leonov is not a girl, as you'd specified in your original question. He's an African man with a large hairdo and a brightly colored coat. He should be wandering around your island. You have to capture him, put him in a cell, and use the 'advanced mess hall counter' to interrogate him. Once you've done this, he will go to the conference table as well.
Bob Caine will sent an assault force to your island, which you will have to repel. Once you've done this, Bob will be willing to come to your conference table as well.
At this point, and only at this point, can you trigger the cutscene that completes this objective. There's a point-by-point walkthrough on the Evil Genius Wiki that might make a good reference if this didn't solve your issue in particular.