Nudity is sometimes used as a tactic during a protest to attract media and public attention to a cause, and sometimes promotion of public nudity is itself the objective of a nude protest. The use of the tactic goes back to well published photos of nude protests by svobodniki in Canada in 1903. The tactic has been used by other groups later in the century, especially after the 1960s. Like public nudity in general, the cultural and legal acceptance of nudity as a tactic in protest also varies around the world. Some opponents of any public nudity claim that it is indecent, especially when it can be viewed by children; while others argue that it is a legitimate form of expression covered by the right to free speech.