Carol A. Brook had no office — just a cubbyhole between the library and the copy machine — and an $8,000 salary when she started working for the Federal Defender Program for the Northern District of Illinois in 1976.She couldn’t believe how fortunate she was to have a job with the office that represents indigent defendants facing criminal charges.So fortunate, in fact, that she never sought work anywhere else.“I was lucky enough to find it and lucky enough to get it, so I never left,” Brook …