I looked the most dangerous cities from that link.
Mayors:
St. Louis, Missouri - Tishaura O. Jones - Democrat
Jackson, Mississippi - Chokwe Antar Lumumba - Democrat
Detroit, Michigan - Mike Duggan - Democrat
New Orleans, Louisiana - Latoya Cantrell - Democrat
Baltimore, Maryland - Brandon M. Scott - Democrat
Memphis, Tennessee - Jim Strickland - Democrat
Cleveland, Ohio - Justin Bibb - Democrat
Baton Rouge, Louisiana - Sharon Weston Broome - Democrat
Kansas City, Missouri - Quinton Lucas - Democrat
Shreveport, Louisiana - Adrian Perkins - Democrat