Stars performing for dictators – According to The Daily Mail, Sting performed for Gulnara Karimova, daughter of Uzbekistan President Islam Karimov, in 2010. The paper quoted a statement from him in which he said he was aware of Karimov's poor human rights record but "made the decision to play there in spite of that. I have come to believe that cultural boycotts are not only pointless gestures, they are counterproductive, where proscribed states are further robbed of the open commerce of ideas and art and as a result become even more closed, paranoid and insular."

Stars performing for dictators – Many in the music industry called on Usher to return his fee when it was revealed that, like Beyonce, he had performed for the Gadhafi family at a 2009 New Year's Eve party. He later said he was donating the money to charity.

Stars performing for dictators – Mariah Carey had also performed for the Gadhafi family at a New Year's Eve party, but in 2008. She later said she was "naive and unaware of who I was booked to perform for. I feel horrible and embarrassed to have participated in this mess." She also said she planned to donate the money to charity.

Stars performing for dictators – Nelly Furtado tweeted that she would donate the $1 million she received for performing for the Gadhafi family in 2007.

Rapper Nicki Minaj has joined a list of pop stars to court controversy by performing for leaders accused of human rights abuses.

The American singer took to the stage in Angola Saturday for Unitel -- a company partially owned by the family of Angolan President José Eduardo dos Santos -- despite allegations of corruption and human rights abuses in the country.

Minaj, 33, was reportedly paid $2 million for her performance, which was financed by the mobile phone company.

The Human Rights Foundation had urged Minaj to cancel the show, accusing dos Santos of exploiting "Angola's diamond and oil wealth to amass an illegitimate fortune while maintaining control over all branches of the government, the military, and civil society."

"Dos Santos has made it his policy to harass, imprison, or kill politicians, journalists, and activists who protest his rule," the Human Rights Foundation said in an open letter to Minaj.

Unmoved by the appeal, Minaj not only performed as planned, but took the opportunity to post photos to Instagram to show her excitement, draped in the Angolan flag.

Minaj even described billionaire Isabel dos Santos -- the President's daughter, and part owner of Unitel -- as an inspiration and an example of "Girl Power."

The Human Rights Foundation said the rapper's actions in the face of corruption were "jarring" when contrasted with her work to encourage social justice.

She is involved with a number of charities including the Get Schooled Foundation, which helps motivate young people to finish their education.

Angola ranked 161st out of 175 countries in the 2014 Transparency International corruption index. Dos Santos has been in power there for 36 years.

The singer responded to criticism on Twitter: "Every tongue that rises up against me in judgment shall be condemned."

Minaj is not the first star to take flak for performing for controversial figures. She joins an elite club that includes Beyonce, Kanye West, Usher, Jennifer Lopez, Sting, Mariah Carey and Nelly Furtado.