Solution—The Break

Before ascertaining the killer’s identity we will find out who is the mob front.

The front is not Louis Segal (2). And he is not Anton Kroll or Sam Chapin (3), therefore the front is Dan Morgan. Dan Morgan (the front) is not the killer (4). The killer is not Louis Segal (2 and 4) and in (5) we learn Anton Kroll is not the murderer. Hence the man who killed Trooper Burton is Sam Chapin.

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GO BACK; THE VIRTUE OF YOUR NAME IS NOT HERE PASSABLE.

—Shakespeare