Based on this information given, what groups combined to create the New JEWEL Movement, and on what date were they organized by which leader?

Context: The New JEWEL Movement was formally established on 11 March 1973 as an alliance of the Joint Endeavor for Welfare, Education, and Liberation, Organization for Revolutionary Education and Liberation, and the Movement for Assemblies of the People, led by young lawyer Maurice Bishop. The NJM's initial manifesto was largely drafted by MAP's major intellectual, Franklyn Harvey, who had been heavily influenced by the writings of C.L.R. James. From 1973 to 1979, the NJM was an opposition political party active in Grenada. During the 1970s, the political situation in Grenada became increasingly polarized and violent. For the 1976 general elections the organisation formed an electoral coalition known as the People's Alliance with the Grenada National Party and the United People's Party. However, the alliance lost to the ruling Grenada United Labour Party in elections which were branded fraudulent by international observers. In the late 1970s, the NJM formed the National Liberation Army, also known as "the 12 Apostles".

Answer: On March 11th 1973, Maurice Bishop brought together the Joint Endeavor for Welfare, Education, and Liberation (JEWEL), Organization for Revolutionary Education and Liberation, and the Movement for Assemblies of the People to form the New JEWEL Movement.