Supporting character, possibly a tough enforcer or ally.
Popeye operates as Capone's direct enforcer.
Capone sends Popeye to carry out Yoho's death warrant, and Popeye deliberately gets arrested to attack Yoho in prison.
Popeye is the immediate physical threat created by Capone.
Popeye is sent to kill Yoho and deliberately gets arrested in order to kill him inside the prison.
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