Actor and activist James Cromwell was sentenced to a week in jail for not paying fines related to his arrest at a protest at a New York power plant.

Cromwell was sentenced to seven days in jail on Thursday after obstructing traffic by staging a protest at a natural-gas power plant in Wawayanda, N.Y., in December 2015. Subsequently, he refused to pay the fine for a violation of obstruction of traffic.

Cromwell was among a group of six or seven other environmentalists at the sit-in. The protesters said the plant poses a threat to the environment. Cromwell was reported to have been shouting “Power to the people!” during the protest. The plant is still under construction and is set to launch in 2018.

The actor lives in Warwick, N.Y. — roughly 15 miles from the Competitive Power Ventures plant.

Cromwell has starred in many films, including Babe, L.A. Confidential, Star Trek: The First Contact, and more. He’s also made appearances on the TV shows American Horror Story, Six Feet Under and 24.

Cromwell is hoping the news of his jail term will move others to take action over the injustice and join the protesters opposing the natural gas power plant. It is believed that toxins from the plant could be dangerous to the heath of nearby residents, and may lower the value of houses in the area.

“If we don’t stay together, nothing will change,” Cromwell said.