An Ivy Leaguer from Texas faces up to seven years in jail in Vietnam for allegedly “causing trouble” at a mass protest.

William Nguyen will go on trial Friday for “disturbing the public order” during a large-scale peaceful demonstration in Ho Chi Minh City on June 10.

Video footage of the 32-year-old from Houston being arrested during the protest show men wearing surgical masks and believed to be undercover police dragging him by the arms and legs in the street, his head covered in blood and missing his shoes.

Nguyen, who was in Vietnam before his graduation from the University of Singapore, was one of thousands demonstrating against a controversial economic policy that would allow long-term leases of land to China.

The only time the Yale undergrad has been seen since was June 18 in a confession aired on national TV.

“I understand that my acts violated the law,” Nguyen said in the address.

But communist Vietnam has a history of suppressing free speech and of forced confessions.

“The image that they’re trying to portray is not who he is. He is definitely not violent,” Victoria Nguyen, his sister, who has launched a social media campaign called “Free Will Nguyen,” told CBS News.

Victoria said their mother was finally able to visit Nguyen in jail on July 17 when she landed to attend his trial and said he was in a cell with 13 other people, had lost 6 pounds and was forced to sleep on a hard surface.

Vi Tran, a lawyer based in Vietnam, told The Guardian that Nguyen could face anywhere from 18 months to seven years in jail — but hoped that diplomatic relations with the US would deter Vietnamese authorities from sentencing him too harshly.

Last week, US Secretary of State Mike Pompeo raised Nguyen’s detainment during a meeting with senior Vietnamese officials in Hanoi and “encouraged a speedy resolution to his case,” according to US State Department spokeswoman Heather Nauert.

With Post wires