TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.
PROBLEM: Category: INSURANCE 
Clue: It's a payment on an insurance policy or a ranking, especially for a brand of saltine

SOLUTION: premium

PROBLEM: Category: "HEAD" LINES 
Clue: This phrase may precede "above the rest" or "shampoo"

SOLUTION: head and shoulders

PROBLEM: Category: LABOR 
Clue: In the 1860s some well-"train"ed workers met to form the BLE, the Brotherhood of these

SOLUTION:
locomotive engineers