Bring charges
What The decision to prosecute, that is to bring a suspect before a court and ask the court to decide whether the person is guilty.
Who A prosecutor (åklagare), a public official at the Prosecution Authority (Åklagarmyndigheten), who judges whether the evidence is enough for a conviction.
How As an injured party or a witness you can be called to the trial, and as a suspect you have the right to a defence lawyer who represents you.