Canwest News Service: Twenty aspiring activists received a lesson on how to create a human blockade as part of an oilsands protest training conference held during the weekend in Saskatoon. They sat on the floor of a small classroom on the University of Saskatchewan campus with their arms and legs intertwined as Greenpeace activist Mike Hudema and his helpers attempted to break them apart. The class was one of many seminars offered as part of the conference hosted by such organizations as Greenpeace, …