During the 1960s and 1970s, a significant social movement emerged in the United States that questioned traditional values and norms. This movement, often associated with young people, sought to change societal norms related to civil rights, gender equality, and cultural expression. It was characterized by a rejection of materialism and an embrace of alternative lifestyles, which included artistic expression, communal living, and anti-establishment sentiments. This movement is commonly referred to as the counterculture. Which of the following groups was primarily associated with the counterculture movement of this era?