The phrase "a group with which" is correct and usable in written English.
It can be used when referring to a specific group that is being discussed or mentioned in relation to an action or characteristic.
Example: "She is part of a group with which I have collaborated on several projects."
Alternatives: "a group that" or "a group I work with".
Dr. Shaikh has been championed by the International Humanist and Ethical Union, a group with which he has been associated.
Her agency is The Travel Business — not Tzell Travel, a group with which her agency is affiliated.
However, it is also a working-class state, a group with which Mr. Romney has sometimes struggled.
But Arizona does contain its fair share of older voters, a group with which Mr. Gingrich has sometimes polled strongly.
In particular, people are often motivated by their desire to conform with the group, especially if it's a group with which they identify.
It is also deeply troubling to see Fraser defending the indefensible because it is done by a group with which he feels moved to identify.
Susana Martinez, the governor of New Mexico, is another prospective vice-presidential candidate, with the advantage of not only being from a Latino background but a woman, a demographic group with which Romney struggles compared with Obama.
Nor did the president of Save a Torah, a nonprofit group with which Rabbi Youlus has been connected.
In 2005, for example, Bruce Reed, a longtime aide to former President Bill Clinton, characterized Hillary -- at the time a Democratic senator for New York -- as "quite culturally conservative," and therefore "a natural choice" to define a policy agenda for the Democratic Leadership Council, a centrist group with which she had a leadership role. .
Liberia now joins a group with Senegal, Uganda and Angola, which will be played between June 2012 and September 2013.
He uploaded it to a site maintained by a release group with which he's affiliated.
