Canter’s proposition is that the teacher has the right to decide what is best for their students and that no student should prevent any other from learning.
The teacher should very clear boundaries as to how they expect their students to behave and work, the students should know what these boundaries are and any deviation should be met with an assertive action from the teacher.
This all sounds quite draconian, right?
However, if the teacher gives a firm, clear instruction and those instructions are met, they should be followed by positive reinforcement (see Skinner above). Any deviation from the instruction should be met with negative consequences that the students have prior knowledge of.