MILWAUKEE (CBS 58) -- Three Milwaukee siblings have been charged with conspiring to intimidate a key witness in an armed robbery trial by threatening her with immigration enforcement, according to two criminal complaints issued in Milwaukee County Circuit Court.

The witness testified Tuesday, July 22 against 31-year-old James Jamall Hughes, who was on trial while jailed for robbing her of a Ford Edge. After she took the stand, Hughes pleaded guilty.

Prosecutors say the day before her testimony, Hughes called his sister, 35-year-old, Jassmine Shydae Mulbah from jail. During the recorded call, he gave her the victim’s phone number and told her to send a message that read "ICE" with the date of testimony.

Mulbah later admitted she and her sister, 29-year-old Betina Hughes, carried out the plan and contacted immigration authorities, according to the complaint.

The witness told investigators two women in the courtroom appeared to record her while she testified. During a break, one followed her into the hallway. Her husband said another woman confronted him in a waiting area, yelled at him and threatened to call immigration while he held their child.

Mulbah was arrested Sept. 2 and acknowledged her role, according to the complaints. Betina Hughes was identified as the person with the phone in court. James Hughes later told investigators he did not remember giving out the victim’s number.