(a) Members of the teaching profession shall have and shall be protected in the exercise of the right to form, join or assist, or refuse to form, join or assist, any organization for professional or economic improvement and to negotiate in good faith through representatives of their own choosing with respect to salaries, hours and other conditions of employment free from interference, restraint, coercion or discriminatory practices by any employing board of education or administrative agents or representatives thereof in derogation of the rights guaranteed by this section and sections 10-153b to 10-153n , inclusive.
(b) The organization designated as the exclusive representative of a teachers' or administrators' unit shall have a duty of fair representation to the members of such unit.
(c) Nothing in this section or in any other section of the general statutes shall preclude a local or regional board of education from making an agreement with an exclusive bargaining representative to require as a condition of employment that all employees in a bargaining unit pay to the exclusive bargaining representative of such employees an annual service fee, not greater than the amount of dues uniformly required of members of the exclusive bargaining representative organization, which represents the costs of collective bargaining, contract administration and grievance adjustment; and that such service fee be collected by means of a payroll deduction from each employee in the bargaining unit.