In mid-1968 the movement began underground actions. Their first action was to capture a cyclostyle printing machine, with which the theoretical organ of the movement, "Lal Jhanda", was printed. On January 8, 1970, the group hoisted the flag of East Bengal (the present national flag of Bangladesh) at Dhaka, Munshigonj and Mymensingh. On Karl Marx's birthday, May 6, 1970, the group threw bomb into the Pakistan Council office in Dhaka. In October the same year, the group attacked a number of buildings around East Pakistan with bombs, including the American Information Centre.