<a href="https://en.wikipedia.org/wiki/May_Thirtieth_Movement" id="mw5g" rel="mw:WikiLink" title="May Thirtieth Movement">May Thirtieth Movement</a>: <a href="https://en.wikipedia.org/wiki/Shanghai_Municipal_Police" id="mw5w" rel="mw:WikiLink" title="Shanghai Municipal Police">Shanghai Municipal Police</a> Force shoot and kill 13 protesting workers.