Charter Schools are not Public Schools but Private Corporations

A public school should be defined by the fact that public schools are governed and administered publicly. The charter school industry has attempted to redefine themselves as public schools because they receive public funding but they quite simply are not public schools because they are governed by non-profit and for-profit corporate managers who are not publicly elected and who are not responsible to the community but to their own special interest. Charter schools ARE NOT public schools as much as they would like to brand themselves in this way, they are not accountable to voters and yet they receive public tax funding.  The National Labor Relations Board labelled them government contractors.
Saying a school is public does not make it so.
See the Washington Post
story from last year to learn more about the National Labor Relations Board
(Charter schools are not public schools.)