What was the primary purpose of political machines?

In reference, The Encyclopædia Britannica defines "political machine" as, "in U.S. politics, a party organization, headed by a single boss or small autocratic group, that commands enough votes to maintain political and administrative control of a city, county, or state".

SO: It's purpose primarily serves to gain and maintain political and administrative control of city/county/state, none the less the population.

explanation:

a trial judge has broad powers in his courtroom. the judge's decision is usually final for the duration of the trial, and the party's one special type of witness is an expert witness.

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