| March 21st, 1937Ponce Massacre: 18 people and a 7-yr-old girl in Ponce, Puerto Rico are gunned down by a police squad acting under orders of US-appointed PR Governor, Blanton C. Winship. event on March 21, 1937.  Read about how to open files in Open File Database.
 Events around March 21, 1937
| March 23rd, 1937 | Birth | Robert Gallo, American physician |  |