Loker represents the organized pursuit of escaped enslaved people.
Loker accompanies Marks in tracking Eliza and Harry and participates in their legal recapture.
His actions contribute to Harry's separation and forced sale.
Loker joins the pursuit that results in Harry's recapture after Eliza crosses the river.
They operate as a coordinated slave-catching team.
The plot calls Loker Marks's partner, and the two work together as opportunistic slave catchers.
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