Czechoslovakian gymnast Věra Čáslavská won four gold medals at the 1968 Olympics in Mexico City but afterwards was denied the right to travel, work and attend sporting events, forcing her retirement. It followed two incidents on the medal podium when she quietly turned her head down and away during the playing of the Soviet national anthem. The action was Čáslavská's silent protest against the recent invasion of Czechoslovakia and her actions made her a persona non grata in the new regime