0 present participle of subpoena
1 to order someone to go to a law court to answer questions:
[ + to infinitive ] They were subpoenaed to testify before the judge.
A friend of the victim was subpoenaed as a witness by lawyers representing the accused.
Such a board should have legally enforceable powers and be able to undertake specific investigations, including the subpoenaing of witnesses if necessary in inquiries into allegations of discrimination.
The committee is perfectly capable of subpoenaing people to come along to give it such technical advice as and when it is needed.