Is eff only for US? Seems the form from the link you provided is only for sending messages to US politicians.. would be nice if all countries involved had a form like this.
For direct political lobbying yes. Some of their issues are transnational (like when they put pressure on companies), and they criticize governments worldwide. But when they directly lobby politicians it's typically only the American ones. It can get legally tricky to do otherwise, because many countries have laws restricting foreign organizations from becoming directly involved in elections/campaigning.
In some European countries, one of the members of EDRi might be worth looking into (some are more politically active than others): https://en.wikipedia.org/wiki/European_Digital_Rights#Member...