Short answers, pulled from the story.
Maurice Bishop and his New Jewel Movement seized power in a nearly bloodless coup while Prime Minister Eric Gairy was temporarily out of the country. The new administration suspended the constitution and detained several political prisoners.
H-hour for the invasion was set for 05:00 on the 25th of October 1983. U.S. troops deployed for Grenada by helicopter from Grantley Adams International Airport on Barbados before daybreak.
The United Nations General Assembly condemned it as a flagrant violation of international law on the 2nd of November 1983, by a vote of 108 to 9. The UN Charter prohibits the use of force by member states except in cases of self-defense or when specifically authorized by the UN Security Council.
Congress investigated many of the problems and passed the Goldwater-Nichols Act of 1986. This act reworked the command structure of the military, making the most sweeping changes to the Department of Defense since the department was established in the National Security Act of 1947.
On the 29th of May 2009, the Grenadian government changed the name of Point Salines International Airport to Maurice Bishop International Airport. Hundreds of Grenadians turned out for the occasion to honor Bishop's memory.