Progressive Student Union was a CSU Chico student organization in the late 20th and early 21st Century. It started originally as the Orange Street Collective. The PSU was a political activist organization. It was officially a non-partisan group that embraced progressive values, including but not limited to "participatory democracy, community empowerment, students' rights, freedom of speech, and social and environmental justice".

The PSU had accomplished many things in its long history:

Some of the notable members over the years have been:

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