In civil court they will be compelled to take the stand to testify or plead the 5th ..
also in the deposition - when they are questioned .. and must answer or plead the 5th ..
Direct and Cross Examination of Witnesses
Civil Trial Process
As part of the presentation of evidence by plaintiffs, witnesses will be called to the stand for direct examination. During this phase, plaintiff attorneys will pose questions to witnesses surrounding the dispute in contests, as well as in some instances, solicit the opinions and conclusions of expert witnesses on a specific matter.
During the cross examination of witnesses, defendant attorneys will seek to impeach, or otherwise discredit, the testimony of witnesses in a number of manners including questioning their moral turpitude, or history of being honest. Additionally, attorneys cross-examining witnesses may produce leading questions that will attempt to promote inconsistencies in a witness’ testimony during the direct examination phase.
You need to do some research on the effect of pleading Fifth Amendment Rights in a civil trial. They are devastating. Taking the fifth in a civil trial may be used as an admission of guilt in a criminal trial. The courts have upheld that particular use many times.