He handed them a the 'plan' that he came up with. Although he didn't have much time but he had been thinking about it for months ever since he met Kate and knew about her past.
It's just he didn't want to go 'nuclear' on them but after finding out more about this family and their different shady businesses, he figured out that they needed to go.
He had to systematically dismantle their operations and make it seem like they imploded from inside without any external interference. It would be a tough sell for anyone else but he was confident that he could do it.
At least he believed in the power of justice even when it seemed like it had been eroded to the point of no return. He had listed people that would work in his favour and would follow the lead that he was going to give to them.