Answer:
Gideon v. Wainwright
Explanation:
According to my research on fundamental Supreme Court cases in American history, I can say that based on the information provided within the question the case that guaranteed this right was the Gideon v. Wainwright case. This was case 372 U.S. 335 decided in 1963 in which the Supreme Court unanimously ruled that states are required under the Sixth Amendment of the U.S. Constitution to provide an attorney to defendants in criminal cases who are unable to afford their own attorneys.
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