Whose rights are protected by Amendments Five through Eight?

Those accused of crimes.

The accused

Explanation:

Amendment 5 is the right against being forced to incriminate yourself.

Amendment 6 is the rights of criminal defendants, (right to a public trial, right to a lawyer etc).

Amendment 7 is the right to a jury trial in civil court cases.

Amendment 8 is the right to not be charged with excessive fines or unusual punishments.

All of these protect the rights of those accused of a crime.