State education officials are telling the city it needs to better staff its school libraries.
State rules require all schools to have at least one part-time librarian, or a full-time one if it has more than 700 students.
Last year, at least half the city's middle and high schools were not following that rule.
The teachers union filed a complaint with the state back in 2010, but it was tossed out on a technicality.
In it, the United Federation of Teachers argued that a school without a staff librarian denies students their full access to an education.
In response to the state's move, the city said in a statement, “School libraries bring tremendous value to school communities, and ensuring all students have access to information services is priority. We are working collaboratively with our partners on a plan to address this.”