Ace's assembled his team of people as soon as he left for office the next day. He put his trusted people to track Astrid and Enlil. He did not condone any phone tapping as he feared she would balk at the idea of him spying on him. But I am doing the exact shit now.
He has army men and women whom his father appointed for their protection. Sometimes he uses them to intimidate his opponents or simply to dig their dirt. They were highly skilled in combat, fights, planning and executing their job. With a lot of power and money involved sometimes, it includes death, but Ace tries to minimize it, not willing it to backfire them.
His private army has tattoos assigned to each, as a symbol to separate them from gangs. It is a cursive W within blue circle logo. It's tiny and only visible upon close inspection. For the sake of security his father named them Sigma Force Securities.