Smaller offenses such as misdemeanors are often only before a judge.
An impartial jury.
an impartial jury is guaranteed in crimalnal cases
Trial by jury is guaranteed by the first amendment.
The grand jury reviews the evidence against the accused
Jury
6th Amendment
Petit jury
If one is on trial for a criminal offense, they are entitled to a trial by jury, but can waive this and be tried just by a judge.
If the procedure happens to exist in that particular state, the individual will first be indicted by a GRAND JURY. When brought to trial their case will be tried by a PETIT JURY. In states with no Grand Jury system, only a Petit Jury is involved.
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By a jury of your peers, or if the accused waives trial by jury, then by the presiding judge.