A Vietnamese court on Tuesday sentenced an activist to nine years in prison on charges of producing videos that defamed the country’s leadership, in the latest crackdown on dissent.

Tran Thi Nga was convicted of spreading propaganda against the state in the one-day trial at the People’s Court in Ha Nam province in northern Vietnam, her lawyer said.

Nga, 40, campaigned against environmental pollution, police brutality and illegal land confiscation, and called for a tougher stance toward China’s assertive territorial claims in the South China Sea.

The court also imposed five years of house arrest following her prison term, lawyer Ha Huy Son said.

“I think this is an unjust verdict,” Son said. “She did not commit the crime for which she was convicted by the court.”