Miley Cyrus -- Occupy Wall Street Leader Calls BS on Cyrus' Vid saying Singer is ALL TALK!

An influential leader in the Occupy movement wants less talk and more action from Miley Cyrus -- telling TMZ, the singer's recent music video in "support" of the Occupy movement is nothing but an empty gesture.

Priscilla Grim -- co-editor of "The Occupied Wall Street Journal" -- tells us, Miley’s music video tribute “rocks" in spirit ... but she doubts the singer has the cojones to actually hit the streets.

Priscilla tells us, “I double dog dare [her] to fight on the front line of economic civil rights at LA City Hall" -- adding, "Revolutionaries occupy, Ms. Cyrus."

Miley’s “Liberty Walk” video (below) encourages protestors to never “give up” and features powerful images from the worldwide Occupy movement.