Before the revolution, Krupskaya worked for five years as an instructor for a factory owner who offered evening classes for his employees. Legally, reading, writing and arithmetic were taught. Illegally, classes with a revolutionary influence were taught for those students who might be ready for them. Krupskaya and other instructors were relieved of duty when nearly 30,000 factory workers in the area went on strike for better wages. Even after the revolution her emphasis was on "the problems of youth organization and education." In order to become educated, they needed better access to books and materials.