Chicago officials canceled classes citywide on Jan. 10 as they failed to reach a new agreement with the Chicago Teachers Union (CTU). Union members voted last week to abruptly shift to virtual teaching, a move rejected by Chicago Public Schools (CPS) and Chicago Mayor Lori Lightfoot. City officials instead canceled classes and have been seeking to convince teachers to get back in the classroom. Thus far, they haven’t been successful, leading to the fourth day of canceled classes. “Although we have been negotiating hard throughout the day, there has not been sufficient progress for us to predict a return to class tomorrow,” Pedro Martinez, CPS chief executive, told parents in a letter on Jan. 9. “We appreciate your patience and will continue providing you with updates as soon as they become available.” Martinez and Lightfoot, a Democrat, say the union’s actions amount to an illegal work stoppage because it can’t, …