Comcast’s controversial move last month to charge extra for cable-TV channel Starz — the home of popular shows like “Power” starring rapper Curtis “50 Cent” Jackson — has begun to attract scrutiny on Capitol Hill.

While the US Department of Justice weighs a possible antitrust probe into the matter, leading US lawmakers including Sen. Susan Collins (R-Maine) and Sen. Dianne Feinstein (D-Calif.), have expressed concerns to federal law enforcement that the move could be anti-competitive, The Post has learned.

Most of the uproar has been over price hikes to watch 50 Cent’s “Power,” which chronicles the upper echelons of the drug underworld. But sources say Maine’s Comcast subscribers are fretting over losing access to “Outlander,” a fantasy series about a World War II-era nurse who gets swept back in time to 1743 Scotland.

“These changes could lessen competition in the video programming market and limit choices for many thousands of consumers in Maine, and millions more across the nation,” Collins wrote in a letter to the DOJ on Sept. 18.

Members of Congress and local lawmakers, meanwhile, are griping to Comcast executives that the hiked fees for Starz violate the cable giant’s pledge to maximize diverse programming, particularly for African-American viewers who are fans of “Power.”

Late Monday, after hearing complaints from local Comcast subscribers, Baltimore’s city council voted unanimously to alert the DOJ, the Federal Trade Commission and the Federal Communications Commission that the cable giant isn’t complying with its franchise obligation to promote diverse shows.

“Comcast agreed to support diversity,” Councilwoman Shannon Sneed, who introduced the resolution, told The Post in an interview. “We are in a majority black city. ‘Power’ is a black show produced by a majority black cast.”

As reported by The Post, the DOJ has been weighing an antitrust probe into the matter. Sources said federal law enforcement has been interviewing Starz and Comcast execs in recent weeks. The probe has been described as “informal,” and no subpoenas or requests for discovery have yet gone out.

In an Oct. 29 response to Collins’ letter, Assistant Attorney General Stephen Boyd said the DOJ “takes seriously its responsibility to enforce antitrust laws to ensure that competition is preserved, and will pursue investigations and potential enforcement actions, where appropriate, to protect competition in video distribution markets.”

At issue is Comcast’s Oct. 16 decision to replace 17 Starz channels in its Xfinity TV package beginning Dec. 10 with movie channel Epix.

Comcast cited increasing options for consumers, noting that Starz is selling directly to consumers online through streaming platforms like Amazon Prime and Roku.

“All we are asking for is the same treatment,” a Comcast rep told The Post on Tuesday, arguing that consumers can pay for Starz a la carte for an additional $12 — just as they would if they bought the channel and streamed it.

Starz owner Lionsgate has been lobbying hard against the move.

Last week, 50 Cent was spotted on Capitol Hill meeting with lawmakers including Nancy Pelosi, tweeting out a photo of himself and the House Speaker, calling her “My #1 Lady.”

Comcast currently carries a host of networks aimed at African-American audiences like BET’s family of networks, OWN, TV One, The Impact Network, The Africa Channel and others.

The company has invested in 8,000 hours of diverse programming on its on-demand platforms, according to a Comcast source.

But in an Oct. 30 letter to Comcast CEO Brian Roberts, six members of Congress, including New York’s Hakeem Jeffries, singled out Starz for its “diverse programming,” according to a copy of the letter obtained by The Post. “This programming is of particular significance to the African-American community.”

With reporting by Josh Kosman