Follow CBSDFW.COM: Facebook | Twitter

CLEVELAND (AP) — Left-leaning activist groups pushing for “economic justice” and an “America First Unity March” sponsored by Citizens for Trump will hit the streets of Cleveland.

READ MORE: Texas Legislature Could Make COVID-19 Liability Lawsuits Harder To Win

Two groups are scheduled to hold rallies and marches Monday, the official start of the four-day Republican National Convention.

There are concerns about violent protests during the RNC between supporters and foes of presumptive Republican nominee Donald Trump.

READ MORE: I-Team: 3 Ways To Avoid Becoming Victim Of Savvy, Sophisticated Scams

Cleveland police reported one arrest Sunday after a man tried to grab a police officer’s gas mask.

Monday also happens to be the 50th anniversary of the beginning of Cleveland’s Hough riots. The riots that began July 18, 1966, were sparked by a confrontation between black residents and a white bar owner and led to nearly a week of looting and violence in one of the city’s east side neighborhoods.

MORE NEWS: Suspects In Custody And Hospitalized Following Chase, Shootout In Johnson County

(© Copyright 2016 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)