Uniformed employees of any city or county police or fire department, while off duty and out of uniform, shall be entitled to:
(a) Place political bumper stickers on their privately-owned vehicles;
(b) Wear political buttons;
(c) Contribute money to political parties, political candidates and political groups of their choice;
(d) Work at the polls on election days;
(e) Aid in registration or purgation of voters;
(f) Become members of political groups; and (g) Hold office in political groups and carry out the mandates of that group.