Question: Who told Dallas police not to use its usual force on the day Kennedy was assassinated?
About the article "Assassination of John F. Kennedy", section "Criticism of Secret Service".

Candidate passages:
Links to U.S. presidents.
Kennedy and Johnson.
On November 22, 1963, Brooks was in the motorcade carrying U.S. President John F. Kennedy and First Lady Jackie Kennedy through downtown Dallas, Texas, when Kennedy was assassinated.
Brooks was a contemporary of Lyndon B. Johnson, who was a U.S.
Senator before becoming Vice-President to Kennedy.
He was present on Air Force One at Dallas Love Field when Johnson was sworn in as President after Kennedy's death. 
Sgt.
Davis, of the Dallas Police Department, believed he had prepared stringent security precautions, in an attempt to prevent demonstrations like those marking the Adlai Stevenson visit from happening again.
The previous month, Stevenson, the United States Ambassador to the United Nations, was assaulted by an anti-UN demonstrator.
But Winston Lawson of the Secret Service, who was in charge of the planning, told the Dallas Police not to assign its usual squad of experienced homicide detectives to follow immediately behind the President's car.
This police protection was routine for both visiting presidents and for motorcades of other visiting dignitaries.
Police Chief Jesse Curry later testified that had his men been in place, they might have been able to stop the assassin before he fired a second shot, because they carried submachine guns and rifles.
An investigation by the House Select Committee on Assassinations (HSCA) in 1979 concluded that "the Secret Service was deficient in the performance of its duties."
The HSCA stated:
That President Kennedy had not received adequate protection in Dallas.
That the Secret Service possessed information that was not properly analyzed, investigated, or used by the Secret Service in connection with the President's trip to Dallas.
That the Secret Service agents in the motorcade were inadequately prepared to protect the President from a sniper.
The HSCA specifically noted:No actions were taken by the agent in the right front seat of the Presidential limousine [ Roy Kellerman ] to cover the President with his body, although it would have been consistent with Secret Service procedure for him to have done so.
The primary function of the agent was to remain at all times in close proximity to the President in the event of such emergencies.
John F. Kennedy, the 35th President of the United States, was assassinated in Dallas, Texas, on November 22, 1963.
Various agencies and government panels have investigated the assassination at length, drawing different conclusions.
Lee Oswald is accepted by official investigations as the assassin, but he was murdered before he could be tried in a court of law.
The discrepancies between the official investigations and the extraordinary nature of the assassination have led to a variety of theories about how and why Kennedy was assassinated.
The House Select Committee on Assassinations (HSCA) concluded in 1979 that Oswald assassinated Kennedy but that a conspiracy was probable.
The committee did not implicate U.S. Intelligence agencies.
Their conclusion was reached almost entirely because of the results of forensic analysis of a police dictabelt, which supposedly recorded the sound of a fourth bullet being fired in Dealey Plaza.
The HSCA also stated that Kennedy did not receive adequate protection in Dallas because Secret Service agents in the motorcade were inadequately prepared to protect the President from a sniper and had not acted upon some relevant information.
This lack of protection may have occurred because Kennedy himself had specifically asked that the Secret Service make itself discreet during the Dallas visit. 
A speech on the assassination of Martin Luther King, Jr. was given on April 4, 1968, by New York Senator Robert F. Kennedy (who was himself assassinated two months later).
Kennedy was campaigning for the 1968 Democratic presidential nomination and had spoken at the University of Notre Dame and Ball State University earlier that day.
Before boarding a plane to fly to Indianapolis for one last campaign speech in a predominantly black neighborhood of the city he learned that Martin Luther King had been shot, leading Kennedy press secretary Frank Mankiewicz to suggest that he ask the audience to pray for the King family and ask them to follow King's deeply held belief in non-violence.
They did not learn that King was dead until they landed in Indianapolis.
Both Mankiewicz and speechwriter Adam Walinsky drafted notes immediately before the rally for Kennedy's use, but Kennedy refused Walinsky's notes, instead using some that he had likely written on the ride over; Mankiewicz arrived after Kennedy had already begun to speak.
Prior to arriving at the rally, the Chief of Police in Indianapolis told Kennedy that he could not provide protection and that giving the remarks would be too dangerous, but Kennedy decided to go ahead regardless.
Standing on a podium mounted on a flatbed truck, Kennedy spoke for just four minutes and fifty-seven seconds.
Robert F. Kennedy was the first to inform the audience of the death of Martin Luther King, causing some in the audience to scream and wail.
Several of Kennedy's aides were even worried that the delivery of this information would result in a riot.
Once the audience quieted down, Kennedy acknowledged that many in the audience would be filled with anger.
But then Kennedy went on: "For those of you who are black and are tempted to fill with -- be filled with hatred and mistrust of the injustice of such an act, against all white people, I would only say that I can also feel in my own heart the same kind of feeling.
I had a member of my family killed, but he was killed by a white man."
These remarks surprised Kennedy aides, who had never heard him speak publicly of John F. Kennedy's death.
Kennedy continued, saying that the country had to make an effort to "go beyond these rather difficult times," and then quoted a poem by the Greek playwright Aeschylus, on the theme of the wisdom that comes, against one's will, from pain.
To conclude, Kennedy said that the country needed and wanted unity between blacks and whites, asked the audience members to pray for the King family and the country, and once more quoted the ancient Greeks.
The speech was credited in part with preventing post-assassination rioting in Indianapolis where it was given, though there were riots in many other parts of the country.
It is widely considered one of the greatest speeches in American history. 
Dr. Joseph Fitzgerald, a Harvard University professor of history from the year 2172, has travelled back in time and assumed the identity of an instructor at Harvard from 1961 to 1963.
In the privacy of his office, Fitzgerald is visited by Dr. Kate Wang, a colleague from his own time.
They discuss his mission, which is to observe the assassination of John F. Kennedy, from whom he is descended.
Fitzgerald is understandably nervous about watching his own ancestor be murdered, especially since he never got to know the man himself; he has met Kennedy only once.
Wang reassures Fitzgerald that every field historian has moments of doubt such as this.
When she departs for their home time, she says something that Fitzgerald does not quite catch.
He decides to get it over with and journeys to Dealey Plaza in Dallas.
However, when he glances up to the Texas School Book Depository and sees Lee Harvey Oswald raise a gun to kill Kennedy, Fitzgerald is unable to stand by and watch the killing.
He intervenes and saves the president's life, shouting for the president and his entourage to take cover.
Oswald fires anyway, but misses, and is later arrested by Dallas police.
A grateful President Kennedy (Andrew Robinson) invites Fitzgerald to stay at the White House.
As Kennedy and his entourage return home, the president is notified that Soviet troops have captured West Berlin.
Fitzgerald is astonished, and claims that Khrushchev would never do such a thing.
Kennedy sadly points out that Khrushchev was assassinated earlier that day.
In his room that night, Fitzgerald frantically consults his time-travel wrist computer, which informs him that his alteration of history has caused massive rips in the fabric of time.
The assassination of Khrushchev was not enough to "fix" the damage to the time stream; the computer informs Fitzgerald that all possible outcomes to this timeline will result in total war between the superpowers and mutual annihilation.
There is only one way to repair the timeline, the computer intones: "The Kennedy presidency must end, as history originally recorded it.
"Meanwhile, the president and his chief Secret Service bodyguard, Ray (Louis Giambalvo), have grown suspicious of Fitzgerald after finding a half dollar coin with Kennedy's face on it (no living American can be depicted on money) which Fitzgerald dropped on Air Force One.
They have also discovered that Fitzgerald's movie camera is not the standard model it appears to be.
Metallurgists cannot open it up or determine what it may be.
They summon Fitzgerald, who tells them that the camera is a holographic camera from the future, as he himself is.
They are skeptical but are convinced of the truth when the professor demonstrates the camera's use.
President Kennedy asks whether Fitzgerald was sent back in time to observe Kennedy's reaction to the Berlin crisis, but the professor replies that he did not know about that.
Kennedy is puzzled at this, until he looks again at the coin and notices the date: 1964.
Kennedy quickly deduces the truth: that Fitzgerald came to Dallas to witness an assassination, Kennedy's own.
Kennedy volunteers to do whatever is necessary to repair history.
Fitzgerald, overwhelmed by his ancestor's heroism, removes his time travel ring and places it on Kennedy's hand.
Kennedy vanishes, and Fitzgerald's computer reports that the president has been transported to the year 2172 - Fitzgerald's home.
The professor tells Ray that a few changes need to be made; then, when Dallas and the motorcade are revisited, it is Fitzgerald who appears in the car and is shot and killed.
At Parkland Memorial Hospital in Dallas, the dead body of "President Kennedy" (actually Fitzgerald) is being attended to by a doctor, who is actually Fitzgerald's colleague from the future.
Ray, the Secret Service agent, recognizes her ring because it is identical to Fitzgerald's.
She tells him that she knew what Fitzgerald's fate would be, saying, "Some of us do our research in the even farther future" and goes on to say, "The last time I saw him I couldn't tell him what I knew.
All I could do was repeat a phrase" - the remark that Fitzgerald didn't quite catch - "in Chinese that my husband taught me."
Holding Fitzgerald's hand tenderly, she repeats the phrase in Chinese and then says it in English: "Goodbye, old friend...
Goodbye."
Ray asks her if what they have seen will change history, and she replies that it will not - because it did not.
"Even the act of traveling in time is part of history," she says.
At Harvard University in 2172, a man speaks to a classroom full of students, delivering a rousing speech in which he implicitly lauds Fitzgerald's sacrifice and the sacrifices of other honorable men like him.
As the camera turns, we see that the speaker, dressed in clothing appropriate to the period, is John F. Kennedy.