Robert Kennedy

Congress passed a law in 1992 requiring the documents surrounding President Kennedy's assassination to be released by 2017, but the release has been held up by national security concerns.

Here are four facts about "Solidarity Now! 1968 Poor People's Campaign," the new exhibition at the Sixth Floor Museum at Dealey Plaza.

The drama on the U.S.-Mexico border the last few weeks has eerie echoes from a half-century ago, when then-U.S. Sen. Robert F. Kennedy went to…