A Long Beach man who went by the nickname "Mac Wimp" is facing federal charges of child sex trafficking for allegedly forcing a 17-year-old girl into prostitution, officials announced Monday.

Ralph Allen Jackson Jr., 40, who was arrested earlier last week on a domestic dispute, is now facing a federal complaint in the U.S. District Court in Los Angeles.

The underage victim -- along with a second unidentified woman -- was forced to have sex with dozens of clients, along with being forced to receive a tattoo that identified her in derogatory terms as belonging to "Mac Wimp," according to an affidavit filed in the case.

The indictment against Jackson is the second federal trafficking charge out of Long Beach in the last two months.

In May, Marquis Horn, 34, and Roshaun Nakia Porter, 37, were charged in federal court with coercing women to work as prostitutes.

Before contacting the federal agency, Long Beach Police filed a number of state charges against Jackson, including human trafficking, false imprisonment, terrorist threats, pimping and pandering.

Long Beach Police would not say why they reached out to federal authorities in this case, other than to say they work with federal jurisdictions to ensure alleged perpetrators are "prosecuted to the fullest extent of the law," Long Beach Chief of Police Jim McDonnell said in a written statement. Thom Mrozek, spokesman with the U.S. Attorney's Office, said federal authorities took the case because of mandatory minimum sentencing requirements under federal law, meaning the suspect could get more time in prison.

Jackson is expected to make his initial appearance in federal court today. If convicted, he faces a mandatory minimum sentence of 15 years to life in federal prison.

"The sex trafficking of women and juveniles is a horrible offense that warrants an immediate and assertive response," U.S. Attorney André Birotte Jr. said in a statement.

According to the 35-page affidavit filed in the case, the victim told investigators she was introduced via phone to Jackson, identified as "RJ," by a woman she met at a party in March. The victim said she exchanged phone calls and texts for two months before meeting Jackson in person. At dinner, during which Jackson complimented her and asked about her sexual history, the victim said when she told him her age and that she would not be 18 until 2014. He replied it would be their "secret."

According to the document, two days after their first dinner together, Jackson drove the victim to Compton to a well-known street prostitution "track" and forced her to begin prostituting.

The victim claims she was forced to have sex with approximately 50 men in two weeks. While allegedly prostituting for Jackson, the victim said she was required to work the streets 12 hours a day and allowed one daily meal and subjected to continual threats and degradation.

In addition to being forced to work on the streets, the victim said Jackson also prostituted her through online services.

The second victim said she first met Jackson after he intervened on her behalf when she was being beaten by another pimp. The next day she was reintroduced to Jackson and began working under similar conditions as the first victim.

The under-aged victim allegedly fled Jackson's residence about eight days ago, after which Jackson allegedly threatened to harm her family if she did not return. When she went to Jackson's home Tuesday to retrieve her things, she had a physical altercation with Jackson prompting the call to Long Beach police.

"The actions of those who prey on the vulnerability of young women in our community and exploit them through threats and intimidation will not be tolerated," McDonnell said. "We will continue to join forces with our federal partners to ensure these individuals are being prosecuted to the fullest extent possible."

The issue of sex trafficking in Los Angeles has been a hot topic in recent years and months.

In May, two Long Beach men, Lebrette Winn, 22, and Eric Avery, 24, were arrested and charged with multiple felonies including human trafficking, pimping, pandering, mayhem and kidnapping. They are currently to be tried by the Los Angeles District Attorney's office.

During the investigation of Winn and Avery, police found a 16-year-old victim allegedly held in Inglewood against her will.

"It's an issue that's bigger than any of us realized," Los Angeles Supervisor Don Knabe said last year of sex trafficking as the Board of Supervisors accepted $1 million in federal grant money to help women and girls who are trafficked into the area for sex.

Authorities believe there may be unknown victims of Jackson. Anyone with information is encouraged to call HSI's toll-free tip line at 1-866-DHS-2ICE (1-866-347-2423) or submit a information using HSI's online tip form at ice.gov/exec/forms/hsi-tips/tips.asp.

Contact Greg Mellen at 562-714-2093