 Complete the following phrase:  The Progressive Student Network PSN was a national, multi-issue, progressive college student activist organization in the United States. It was founded at a conference in 1980 as a merger of the Revolutionary Student Brigade, the Midwest Coalition against Registration and the Draft Mid-CARD, and the Student Coalition Against Nukes Nationwide SCANN. The founding of the PSN commemorated the 10 year anniversary of the National Guard killing student anti-war protesters at 