The North Star chapter of the Sierra Club has joined the fight against a proposed constitutional amendment that would ban gay marriage in Minnesota.

Minnesotans will decide on the measure next November.

(Related: Second survey finds Minnesotans divided on gay marriage ban.)

In a release issued Friday, the statewide group said the amendment would divide communities and harm families.

“To achieve our mission of environmental protection and a sustainable future for our planet, we must attain social justice and human rights at home and around the globe,” said Margaret Levin, the state director of the Sierra Club North Star Chapter, in a statement. “The Sierra Club North Star Chapter has a long history of working together to protect our communities and our planet. We do not tolerate injustice, and we will not stand by and allow our state constitution to be used as a means of dividing communities and harming families.”

According to The Minnesota Independent, the Sierra Club has previous refused to get involved in similar fights in California and Maine.