The phrase "albeit illegal" is correct and usable in written English.
It can be used to acknowledge a fact or situation while also noting an exception or limitation, in this case, the illegality of the action.
Example: "The proposal was innovative, albeit illegal, and sparked a heated debate among the committee members."
Alternatives: "although unlawful" or "even if it's against the law."
Their first step was simple, albeit illegal.
By the reign of Lance Armstrong, blood doping was the ubiquitous albeit illegal drug of choice.
Most at risk are black women from low-income groups, Diniz said, because richer Brazilian women can afford to pay for safer, albeit illegal, abortions.
Your boss may have acquired free (albeit illegal) images rather than bought them and provided a financial incentive to those who harm children.
Using child workers from a remote region, many of whom cannot even speak Mandarin, the country's main national dialect, have provided a temporary, albeit illegal, solution.
During those heady days in the 1970s, as the city went broke and crazy, armies of young people swept through tunnels and yards, leaving behind rolling — albeit illegal — murals on steel canvases.
Like a business, the purpose of organized criminal activity is to obtain maximum pecuniary profit, albeit by illegal means.
The Internet, however, opened a whole new world, allowing metal fans to enjoy unlimited and uninterrupted access the music — albeit through illegal downloads — even while it remained unavailable in mainstream music stores.
Given that I neither requested nor accepted any compensation from the companies involved, I can tell you in retrospect, it was a labor of love, albeit an illegal one.
In 1792 the couple were arrested in Boston some weeks into a run of The School for Scandal; it was reputedly Boston's first theatrical season, albeit an illegal one.
If you imperiled only yourself, you could be as thrill-seeking as you wished, but by talking on the phone while driving, you endanger other people on the road, and that's unethical, albeit not illegal.
