In Memory Of MaSisulu, The Rock Of South Africa
When Albertina Sisulu and a few other women organized a protest in 1956 of the passbooks that were the bedrock of South Africa's apartheid laws, they chanted, "When you tamper with women, you strike a rock." And MaSisulu, as she came to be known, became the rock on which a new nation is rising.
Source: http://www.npr.org/2011/06/11/137122905/in-memory-of-masisulu-the-rock-of-south-africa?ft=1&f=1004