Cordiant Communications Group was created in 1995.
Inter in group communications is the communication between one group and another. Intra in group communications is communication between the members of a particular group.
Spectra Communications Group was created in 1999.
Burrell Communications Group was created in 1971.
Martz Communications Group was created in 1986.
Current Communications Group was created on 2000-01-01.
Alliance Communications ended in 1998.
Carlton Communications ended in 2004.
Rapid Communications ended in 2009.
Clearnet Communications ended in 2000.
MCI Communications ended in 1997.
Storer Communications ended in 1983.