The correct answer to this open question is the following.
Although the question is incomplete because it does not provide a specific reference about the author of the letter or any other reference, we can comment on the following.
A primary source is the piece of information that was written by a character or an individual that lived in the moment of the event, was part of the event, or witnessed the event. This individual could have written a letter, or a document -including a book. Or he/she took a photograph. Or was part of an interview. The secondary source includes information from a third person who was not part of the time or event but has found information through other resources. It is the case of an encyclopedia or researchers/historian books.
<span> He or she must prove that the slanderous statement was made with actual malice.
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The supreme court case is called <span>New York Times Co. v. Sullivan. in the ruling it was held that actual malice must established in defining slanderous statement for compensation purposes.
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<span>if you mean the civil war they were used to silence critics with the threat of arbitrary arrest.
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The ancient Roman and Greek civilizations had well-organized political processes that greatly influenced the manner in which later governments were structured in Europe and the United States. The system of political parties, the establishment of divisions in government -- even political words such as democracy, monarchy and tyranny -- originated in ancient Rome and Greece. Although Rome drew many of its political principles from the Greeks, and as a result, developed a government similar to that of Greece, there were several differences between the two.