Las Damas de Blanco was founded to push for the release of 75 dissidents, human rights activists and other arrested in March 2003.
Democracy advocates say the group is remarkable in Cuba because it accomplished its main goal - the 75 prisoners were freed.
In April 2011, the State Department gave the group its Human Rights Defenders Award.
Supporters of Cuba's socialist government accuse the group of receiving U.S. government funds.
In this video, Las Damas shout "Liberty, liberty, liberty!" at the end of the morning's march. Then they gather in a nearby park.
U.S. Interests Section employee Kathleen Duffy can be seen greeting and chatting with members of the group.