Question: How many Jehovah's Witnesses were forced to wear a purple triangle and be put in camps?
About the article "The Holocaust", section "Jehovah's Witnesses".

Candidate passages:
Refusing to pledge allegiance to the Nazi party or to serve in the military, roughly 12,000 Jehovah's Witnesses were forced to wear a purple triangle and were placed in camps where they were given the option of renouncing their faith and submitting to the state's authority.
Between 2,500 and 5,000 were killed.
Historian Detlef Garbe, director at the Neuengamme (Hamburg) Memorial, writes that "no other religious movement resisted the pressure to conform to National Socialism with comparable unanimity and steadfastness."
Estimates vary widely as to the number of gay men imprisoned in concentration camps during the Holocaust, ranging from 5,000 to 15,000, many of whom died.
In addition, records as to the specific reasons for internment are non-existent in many areas, making it hard to put an exact number on exactly how many gay men perished in death camps.
See "pink triangle".
Gay men suffered unusually cruel treatment in the concentration camps.
They faced persecution not only from German soldiers but also from other prisoners, and many gay men were beaten to death.
Additionally, gay men in forced labor camps routinely received more grueling and dangerous work assignments than other non-Jewish inmates, under the policy of "Extermination Through Work".
SS soldiers also were known to use gay men for target practice, aiming their weapons at the pink triangles their human targets were forced to wear .
The harsh treatment can be attributed to the view of the SS guards toward gay men, as well as to the homophobic attitudes present in German society at large.
The marginalization of gay men in Germany was reflected in the camps.
Many died from beatings, some of them inflicted by other prisoners.
Nazi doctors often used gay men for scientific experiments in an attempt to locate a "gay gene" to "cure" any future Aryan children who were gay.
Experiences such as these can account for the high death rate of gay men in the camps as compared to the other "anti-social groups."
A study by Rüdiger Lautmann found that 60% of gay men in concentration camps died, as compared to 41% for political prisoners and 35% for Jehovah's Witnesses.
The study also shows that survival rates for gay men were slightly higher for internees from the middle and upper classes and for married bisexual men and those with children. 
  Red triangle—political prisoners: social democrats, socialists, trade unionists, Freemasons, communists, and anarchists.
Green triangle— "professional criminals" (convicts, often working in the camps as Kapos).
Blue triangle—foreign forced laborers, emigrants.
Purple triangle—primarily Jehovah's Witnesses, and members of other Bible Student groups.
Pink triangle—primarily homosexual men, as well as sexual offenders including rapists, paedophiles and zoophiles.
Black triangle—people who were deemed "asocial elements" and "work shy" including * Roma (Gypsies), who were later assigned a brown triangle * The mentally ill * Alcoholics * Vagrants and beggars * Pacifists * Conscription resisters * Lesbians * Prostitutes * Some anarchists * Drug addicts  Brown triangle—Roma (Gypsies) (previously wore the black triangle).
Uninverted red triangle—an enemy POW, spy or a deserter.
Single triangles.
People who wore the green and pink triangles were convicted in criminal courts and may have been transferred to the criminal prison systems after the camps were liberated. 
The two largest groups containing prisoners in the camps, both numbering in the millions, were the Polish Jews and the Soviet prisoners of war (POWs) held without trial or judicial process.
There were also large numbers of Roma (or Gypsies), ethnic Poles, political prisoners, homosexuals, people with disabilities, Jehovah's Witnesses, Catholic clergy, Eastern European intellectuals and others (including common criminals, as declared by the Nazis).
In addition, a small number of Western Allied aviators were sent to concentration camps as spies.
Western Allied POWs who were Jews, or whom the Nazis believed to be Jewish, were usually sent to ordinary POW camps; however, a small number were sent to concentration camps under antisemitic policies.
Sometimes the concentration camps were used to hold important prisoners, such as the generals involved in the attempted assassination of Hitler; U-boat Captain-turned-Lutheran pastor Martin Niemöller; and Admiral Wilhelm Canaris, who was interned at Flossenbürg on February 7, 1945, until he was hanged on April 9, shortly before the war’s end.
In most camps, prisoners were forced to wear identifying overalls with colored badges according to their categorization: red triangles for Communists and other political prisoners, green triangles for common criminals, pink for homosexual men, purple for Jehovah's Witnesses, black for Gypsies and asocials, and yellow for Jews. 
Jehovah's Witnesses came into conflict with the Nazi regime because they refused to salute Adolf Hitler with the traditional "Heil Hitler" salute, believing that it conflicted with their worship of God.
Because refusing to salute Hitler was considered a crime, Jehovah's Witnesses were arrested, and their children attending school were expelled, detained and separated from their families.
When Germany made military enlistment mandatory, Jehovah’s Witnesses were persecuted because they refused to bear arms.
Being politically neutral, they also refused to vote in the 1936 elections.
Based on Nuremberg Laws, Jehovah's Witnesses who were also classified as ethnic Jews wore a badge comprising a purple triangle superimposed on a yellow triangle.