subpoena (someone or something) to (do something)
To issue a formal legal order under authority of a court of law commanding a person to appear at court or do something in court. His life could be in danger if the mob finds out he's been subpoenaed to testify. I didn't even know that I had been given a speeding ticket until I was subpoenaed to appear in court and pay the fine I owed.
subpoena someone to do something
to formally deliver a document forcing someone to do something for a legal process. The attorney subpoenaed a number of witnesses to testify. I subpoenaed four witnesses to appear but none of them showed up.