The phrase "a group of concerned" is correct and usable in written English.
It can be used when referring to a collective of individuals who share a common concern or interest about a particular issue.
Example: "A group of concerned citizens gathered to discuss the environmental impact of the new development project."
Alternatives: "a coalition of worried" or "a gathering of anxious".
Founded in 2010 by a group of concerned Christian women, Women of Hope International works with people living with disabilities in Sierra Leone.
The LRA lacks resources to market these houses to potential homeowners and developers, so a group of concerned preservationists decided to lend some help.
In 1956, Keating joined a priest leading a group of concerned Catholics in Cincinnati who were concerned about the dangers of pornography, and he began giving talks on the subject to parents and other groups.
It was a group of concerned Labour MPs from one of the areas to be visited, concerned about their electoral chances under Brown, who were key in September's plot to oust the prime minister - the "Lancashire mafia".
While Occupy London and a group of concerned residents of Wandsworth, south-west London, may not make obvious bedfellows, they have joined forces in an attempt to save an adventure playground from planned council cuts.
The writer claimed to represent a group of concerned members, but that could not be verified.
The student ambassador was fielding questions from a group of concerned mums and dads about life at Keele University.
Now that 38 Degrees, a group of concerned citizens, has sought the advice of leading lawyers, the confusion thickens further.
Bunting and a group of concerned neighbours meet around a kitchen table to discuss how to respond.
The other day, Adrian Benepe, the current parks commissioner, toured Van Cortlandt Park with a group of concerned Bronx citizens.
A group of concerned Sky Walkers decided to blow the whistle, agreeing to be interviewed on video by the Guardian about sharp practices.
