When I was 13 a Robbinsdale MN cop threatened to make me and my friend disappear by, "taking you guys down to the river (like Emmett Till, who I envisioned then). When I was 20 a couple of cops jumped out of their squad cars to detain me for walking along the curb on Plymouth Ave – where Minneapolis Police Department killed unarmed, handcuffed 20 y/o #JamarClark  last night. During a blizzard, they violently attacked me (two additional cops joined them in unsuccessfully trying to throw...