Among the theoretical derivates of Frankfurt School are so-called ''[[Critical theory]]'' and professors of this school were the source of the ideas that fueled what is now known as Student's protests of 1968.<ref name="Kuby2015"/><ref>{{cite web |title= Columbia University 1968: Personal recollections of the 1968 student uprising at Columbia University. |author=Frank da Cruz |date=April 1998 |url=http://www.columbia.edu/cu/computinghistory/1968/ |accessdate=5 Jan 2017 |quote=Throughout the mid-to-late 60s there was all sorts of political activity on campus – teach-ins on Pentagon economics, Sundial rallies against the war, demonstrations against class rank reporting, confrontations with military recruiters, etc. It was an era of bullhorns. ...}}</ref> | Among the theoretical derivates of Frankfurt School are so-called ''[[Critical theory]]'' and professors of this school were the source of the ideas that fueled what is now known as Student's protests of 1968.<ref name="Kuby2015"/><ref>{{cite web |title= Columbia University 1968: Personal recollections of the 1968 student uprising at Columbia University. |author=Frank da Cruz |date=April 1998 |url=http://www.columbia.edu/cu/computinghistory/1968/ |accessdate=5 Jan 2017 |quote=Throughout the mid-to-late 60s there was all sorts of political activity on campus – teach-ins on Pentagon economics, Sundial rallies against the war, demonstrations against class rank reporting, confrontations with military recruiters, etc. It was an era of bullhorns. ...}}</ref> |