1916- Faced with salary cuts and "yellow dog" contract, Chicago teachers take first steps to form national teachers union. Delegates from locals in Gary, Ind., New York, N.Y., Oklahoma City, OK., Scranton, PA. and Washington, D.C. meet and found American Federation of Teachers. Month later, union is chartered by American Federation of Labor (AFL).
1920’s- Early attempt to organize union of Detroit teachers fails when city’s daily newspapers launch media attack on teacher "unionism" and principals threaten instant dismissal of teachers who dare to join up.
1931 - On February 24, a feisty band of Detroit teachers, ignoring threats of reprisals from school administration, is awarded charter as Detroit Federation of Teachers Local 231.
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