Certain campaign tactics be considered illegal, but what I want to know is why is the focus only on this wrongdoing at Clinton rallies? There was instance after instance after instance of plants of protesters at Trump rallies, yet there seems to be no outrage. This is evidence of a left leaning press.
Yes, certain campaign tactics should be considered illegal. Planting hecklers at someone's rally is not one of these tactics, however. Planting hecklers is, in effect, not very different from the traditionally staged protests right outside political rallies. In light of this past year's presidential race, political campaigns seem to be getting dirtier and dirtier, and more legislation is needed in order to clean them up.
A person doesn't have the right to go around and make other people unable to do the things they want to do. People have the right to peaceably assemble. No private person, especially a person that is running against another person in a political campaign, should be able to interrupt that.
When hecklers are planted at the rallies of politicians, such as Hilary Clinton, this tactic should not be considered illegal because it falls under the freedom of speech clause of the Constitution of the United States. It may be an unfair or unethical practice in journalism, but it is not illegal because everyone, even those who don't support the politician should be allowed to say what they want at rallies.