Trump's tweet that got tagged for 'glorifying violence' used a phrase from a 1960s cop whose policies started a race riot

• Twitter on Friday tagged a tweet by President Donald Trump about protests in Minneapolis with a warning that it glorified violence.
• In the last line of the tweet, Trump said that "when the looting starts, the shooting starts."
• The president seemed to have been quoting the former Miami police chief Walter Headley, whose harsh policing of African American neighborhoods helped spark three days of riots in 1968.
• Twitter said Trump's tweet "violates our policies regarding the glorification of violence based on the historical context of the last line."
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Early on Friday, Twitter escalated its feud with President Donald Trump in dramatic fashion — labelling one of the president's tweets with a warning that it was "glorifying violence." 

The president sent the message late Thursday about the sometimes-violent protests in Minneapolis over the death of George Floyd, an unarmed black man, in police custody. 

The message said: "Just spoke to Governor Tim Walz and told him that the Military is with him all the way. Any difficulty and we will assume control but, when the looting starts, the shooting starts. Thank you!"

In its statement explaining the move, Twitter said it acted because the message "violates our policies regarding the glorification of violence based on the historical context of the last line, its connection to violence, and the risk it could inspire similar actions today."

The "historical context" the company referred to is the 1960s — and the Miami police chief Walter Headley's aggressive policing of black neighborhoods denounced at the time by civil-rights leaders. 

At a news conference in December 1967, as tensions simmered in response to months of police brutality, Headley threatened violent reprisals if the situation escalated.

"When the looting starts, the shooting starts," Headley told reporters, according to media reports at the time.

In August the following year a three-day riot erupted as Richard Nixon was addressing the GOP convention across the city. During the riots the police killed three people and left 18 wounded, alongside 222 arrests, according to a Washington Post account of the unrest.

In its obituary of Headley, The New York Times reported that he had been on vacation when the rioting started and again said "when the looting starts, the shooting starts" when asked whether he would return to oversee the police response. 

"They know what to do," he said of staff officers.

The National Commission on the Causes and Prevention of Violence found that Headley's remarks and policing policies had been a significant factor in sparking the riots. 

Headley died four months after the riots. The Times in its obituary noted his policies had caused "growing resentment" among black Miami residents.