go beyond the boundaries of decency(The aforementioned fellow MEPs who have negotiated with the Council on behalf of Parliament in this manner have gone beyond the boundaries of political decency.Andrey Truhachev)
envelope-pushing(to push it to the limit; The term "pushing the envelope" originally comes from the field of aviation. It is a reference to the flyable portion of the atmosphere that envelopes the earth. Pilots would push the envelope when they were testing the speed or elevation limits of new aircraft. Artjaazz)
fringe(Mainstream journalists often won't cover anything outside "the Overton Window" – a term for anything considered too fringe for serious coverage. -- термин для тем, выходящих за установленные рамки (coasttocoastam.com)ART Vancouver)