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Thus, a person called to testify before Congress can refuse if they believe the government could use the testimony against them in criminal proceedings. To render the protections against self-incrimination ineffective, Congress can provide immunity from criminal prosecution.
They want you live and in person, you are probably a part of the puzzle and they need your testimony. They can haul you into court but they can't make you testify if you invoke the 5th Amendment, but they may have police who can testify as to what you said.