well if they interfere with you and you haven't broken their TOS (or even if you have) it can be construed as a conspiracy against rights, tortious interference if you have a business for example or have media creds; and it can be also 'intimidation of voters' as their behavior is informs you of what is politically unacceptable to them...that's the intimidation all of these activities are unlawful and they are doing them en masse, so a class action would be appropriate to correct these things