Police are investigating whether the bombs were thrown by members of the Janitors' Union retaliating against Jesse Binga, colored real estate dealer who had been hiring non-union janitors, or whether intended as another warning to the colored people to keep out of residential districts that have been hitherto exclusively white.
Post, April 7, 1919:
Bomb Explodes in Flat Where Negro Moved In
Tribune, April 7, 1919:
Bomb Set Off in Negro Flats
White residents of the district had held indignation meetings because he had peopled his building with colored folks.
Herald-Examiner, April 20, 1919:
Office of Wimes & Lassiter, Negro Real Estate Dealers, Was the Target
Tribune, May 18, 1919: