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New York City School Teachers' Strike. September 17, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

New York City School Teachers' Strike. September 17, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

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New York City School Teachers' Strike. September 17, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

New York City School Teachers' Strike. September 17, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

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New York City School Teachers' Strike. September 17, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

New York City School Teachers' Strike. September 17, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

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Pickets and parents and members of the United Federation of Teachers demonstrate in front of P.S. 95 on Hiliman Avenue in the Bronx, while teachers sit-in at second floor window without pupils. October 22, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)

Pickets and parents and members of the United Federation of Teachers demonstrate in front of P.S. 95 on Hiliman Avenue in the Bronx, while teachers sit-in at second floor window without pupils. October 22, 1968. (Photo by Arthur Pomerantz/New York Post Archives /(c) NYP Holdings, Inc. via Getty Images)