Martin Luther King Jr.'s niece, Alveda King, wrote a blistering letter to black legislators on Tuesday criticizing them for not speaking out about the series of videos recently released supposedly depicting Planned Parenthood officials discussing the harvest and sale of tissue from aborted babies.

Addressing the Congressional Black Caucus (CBC), King, a pro-life activist, said her heart is heavy "over the deafening silence" regarding the controversial videos.

"If they or anyone else had been exposed for harvesting and selling animal body parts, there would be such an outrage from the left and right," she wrote.

"'Save the whales! Save the dolphins! Save the doggies and cats!' people would declare. But for some reason it seems to be okay to chop up the unborn babies and harvest their body parts," King added.

The anti-abortion group Center for Medical Progress released a second video on Tuesday depicting a Planned Parenthood official discussing the harvesting of aborted babies' fetal tissue for medical research, as well as the processing costs, as HNGN previously reported. The group released a similar video last week, which was edited in such a way that it appears as if Planned Parenthood sells the body parts for profit, which Planned Parenthood promptly denied was the case.

King went on to suggest that the CBC has not spoken out about the videos because they are "so beholden to the abortion lobby that you are totally paralyzed and unable to garner the necessary will to denounce their behavior."

She noted that the National Black Profile Coalition, of which King is a found member, had previously challenged CBC's support of the abortion industry that disproportionately targets blacks - "those you profess to be protecting and fighting for."

"You never responded," King said.

Surely the recent "gruesome behavior" seen in the Planned Parenthood videos would serve as a catalyst for change, King speculated, saying she believed that "now the CBC will yank their support of an industry that is involved in the illegal harvesting and selling of body parts of aborted babies."

"But yet we hear nothing," she said. "Your silence is defeating."

She then mentioned how her uncle, Martin Luther King Jr., and other prominent men in her family were pro-life.

"Granddaddy even saved me and one of my children from abortion," she reminisced. "Thank God he did."