Occupy Wall Street may seem an odd name for a protest movement, yet the mass assembly of angry and frustrated people in downtown Manhattan — and increasingly in other cites around the country — appears to be this month’s big story and is drawing more support with every passing day. As the protest neared the conclusion of its third week, large labor unions were stepping up and offering support. Today, thousands of activists are expected in Washington’s Freedom Square. Where this all will lead is unknown, but it surely is significant.