Pierce College now creates an online course shell for each class of each instructor using Moodle, an open source Learning Management System. The school automatically populates each Moodle course with students as they enroll in the corresponding real section.
However, the student remains enrolled in the Moodle course even after dropping (or being excluded) from the real course.
Removing a student from a Moodle course is non-intuitive.
First, click on "Assign roles" (in the Adminstration block).
Click on "Student" in the first column ("Roles").
Select the student from the left column (CTRL-click to select multiple students).
Click on the "Remove" button.