Does it violate free speech? Yes. Should it be grounds for getting arrested for violating Constitutional rights? No, that's just silly. All you would do is clog the courts with he said she said cases. Furthermore, the fact the person who was cut off can still say whatever they were about to say if they try again in just a moment mitigates the alleged damage to their freedom of expression.

There are two reasons for interrupting people.

Sometimes when conversations occur, each person might end up having a lot to say and conversational traffic might occur, in this case, people get distracted by their own thoughts or so on, and end up interrupting the other person by focusing on getting their own words that they want to say out of their mouths as quickly as possible.

So interrupting can be unintentional and harmless.

However, there is also another form of interrupting which I don't like. This type of interrupting when committed by some jerk occurs when somebody gives a valid piece of dialogue and the jerk tries to cut off the complete scenario that the other person tries to get across, before they are actually able to finish, this way the jerk tries to win an argument by cutting off the other persons ability to give their own full arguments, thus trying to put the other person either on the defence, make them give way, or to try to get the other person to listen to them.

Jerks do this also as a means to get other people to believe the jerks point of view, while the other persons views is diminished due to them being interrupted.

So yes, I think interrupting somebody CAN be a means of violating somebodies free speech.

Absolutely yes!! People who disagree to this ,please note free speech is a right given to everybody and going against it definitely going violating it! Its as that obvious.

As for the punishment, I cant tell what is to be done. That completely depends on the government. If the scene isn't too severe punishment , in my point of view not really needed the alternative is required.