(Portland, OR)  --  Police say they've arrested three people during a march through the streets of Portland.  The trio are known as leaders of the activist group Portland's Resistance, identified as Gregory McKelvey, Micah Rhodes, and Kathryn Stevens, who each face charges of second-degree disorderly conduct.  The march began after about 50 high-school students gathered at Holladay Park yesterday afternoon to speak against President-elect Donald Trump. Police say McKelvey and the other members of the activist group were arrested after demonstrators ignored officers' orders not to block traffic and proceed in an orderly fashion.