Yes, HIPPIES is a Scrabble word!

Letter values in Scrabble US: H 4, I 1, P 3, P 3, I 1, E 1, S 1.

Is it a valid word?

HIPPIES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a youth subculture (mostly from the middle class) originating in San Francisco in the 1960s; advocated universal love and peace and communes and long hair and soft drugs; favored acid rock and progressive rock music
someone who rejects the established culture; advocates extreme liberalism in politics and lifestyle
someone who rejects the established culture; advocates extreme liberalism in politics and lifestyle

Also: flower people, flower child.