ICOC could mean many things, but if you mean International church of Christ, they are a splinter of the US churches of Christ, so they have restoration movement origins.
They initially had very strict requirements\workload on membership/discipleship and tended to the exclusivist c of C view that not only is baptism an integral part of becoming a Christian but one must believe that you are being baptized to be saved for a baptism to be valid. There was at times in the movement some coercive leadership issues.
There are various groups that operate under that name currently, some have become (in my terms) more mature. I have heard that some ICOC membership attended an evangelism seminar with the other 3 streams of the RM in Australia (ie Australian Churches of Christ, church of Christ (ie non-instrumental) and churches with origins from the US Christian Church/churches of Christ. (Note, there are no Disciples of Christ in Australia.)