A pro-population control group is throwing its support behind Democrats in several key Senate races.

Population Connection, formerly known as Zero Population Growth, describes itself as “America’s voice for population stabilization” and has said that families should be “taxed to the hilt” for “irresponsible breeding.”

Federal Election Commission (FEC) filings show the fringe group’s political arm, Population Connection Action Fund, has donated to six Democratic Senate candidates this election cycle: Kyrsten Sinema of Arizona, Jacky Rosen of Nevada, Tina Smith of Minnesota, Jon Tester of Montana, Sherrod Brown of Ohio and Tammy Baldwin of Wisconsin.

Population Connection Action Fund gave $3,500 to Smith, and $2,500 each to Baldwin, Brown, Rosen Sinema, and Tester, FEC files show.

With the exception of Rosen and Sinema, who both serve in the House, all of the candidates supported by the pro-population control group are incumbents. (RELATED: Republicans Feeling Better Than Ever About Taking Heidi Heitkamp’s Seat)

The Washington Examiner’s Philip Wegmann previously noted the group’s support for several House Democrats, describing the fund as “creepy.” The fund’s support for Senate Democrats this cycle has not been previously reported.

Population Connection was co-founded by former Stanford University professor Paul Ehrlich, whose 1968 book “The Population Bomb” “fueled an anti-population-growth crusade that led to human rights abuses around the world,” Smithsonian Magazine notes.

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