Pro-abortion, pro-choice side was arrested mainly it looks like. 10 day old article.
Police arrested 16 on Thursday after pro-choice rally in downtown St. Louis
By Robert Patrick St. Louis Post-Dispatch May 31, 2019

Updated at 10:40 a.m. Friday with arrest details.
ST. LOUIS — Police arrested Alderman Megan Ellyia Green and several board members of Planned Parenthood of the St. Louis Region on Thursday after a downtown protest over Missouri's new abortion law — and the state's attempt to close Missouri's only remaining abortion clinic.
Green and others sat down in the lobby of the Wainwright State Office Building after a protest in a park between the Gateway Arch and the historic Old Courthouse.
By the time the bulk of the protesters had marched from the park, Green and the others were seated in the lobby of the Wainwright building and security guards had barred and locked the doors.
Read more at: https://www.stltoday.com/news/local/crime-and-courts/police-arrest-alderman-planned-parenthood-board-members-after-downtown-st/article_946f023a-a335-5459-8329-898e0df84c22.html#1