Much of the work was done during the night to avoid disrupting classes.

In high school, he disrupted classes so much that one teacher limited him to one joke a week.

In 2007, the building caught on fire twice, severely disrupting classes and research.

Teachers must be given the freedom to remove pupils when they intimidate others and disrupt classes.

Since schools started opening around the nation in late August, walkouts by teachers have disrupted classes for more than 700,000 students.

Teacher layoffs in the middle of the school year, disrupting classes, now loom as a real possibility.

But the strikes, scheduled to continue over the next few weeks, continue to disrupt classes.

The men disrupt classes several times to x-ray the walls, often repeatedly.

In addition to these successes, the district is also known for a long history of labor disputes which have disrupted classes.

Protests have disrupted classes at half a dozen schools.