Did the RCMP have grounds to spy on Northrop Frye?

The RCMP Security Service once spied on famed literary scholar Northrop Frye, the Canadian Press reports.

According to newly released archival records, Canadian intelligence used a secret informant to compile a 142-page file on the renowned University of Toronto professor. Of particular interest to the RCMP was Frye's involvement in the anti-Vietnam War movement and efforts to stop apartheid in South Africa.