Malone: You said you wanted to know how to get Capone. Do you really want to get him? You see what I'm saying? What are you prepared to do?
Ness: Everything within the law.
Malone: And then what are you prepared to do? If you open the ball on these people, Mr. Ness, you must be prepared to go all the way. Because they won't give up the fight until one of you is dead.
Ness: I want to get Capone. I don't know how to get him.
Malone: You want to get Capone? Here's how you get him: He pulls a knife, you pull a gun. He sends one of yours to the hospital, you send one of his to the morgue! That's the Chicago way! And that's how you get Capone. Now, do you want to do that? Are you ready to do that? I'm making you a deal. Do you want this deal?
Ness: I have sworn to put this man away, with any and all legal means at my disposal, and I will do so.
Malone: Well, the Lord hates a coward. Do you know what a blood oath is, Mr. Ness?
Malone: Good. Because you just took one.
Malone takes Ness to a church where they talk. At the end of their conversation, they shake hands.