What is the main message of this poster?

Answer:
This warns "Colored People" to avoid watchmen and police officers to avoid having to be a slave and to watch out for slave catchers along with kidnappers because they will most likely be caught and punished very brutally.
Explanation:
Many people thought that "colored people" should not have freedom even though Dr.Martin Luthor King Jr. Said from the declaration of independence
"All men are created equal with certain unalienable rights.".
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