What did the court decide in Gideon v. Wainwright?
Answered for: US
Not only these precedents but also reason and reflection require us to recognize that in our adversary system of criminal justice, any person haled into court, who is too poor to hire a lawyer, cannot be assured a fair trial unless counsel is provided for him.
The Court held that the Sixth Amendment right to appointed counsel in criminal cases applies to the states through the Fourteenth Amendment. The sentence above is the court in its own words.
This answer is true in US and nowhere else on this site. Another jurisdiction is another answer, or an honest gap: see what has been read for US.