ROES is the plural for an unidentified person, "Richard ROE", like in "John DOE".
In most legal contexts, ROE is used for unidentified or anonymous defendants, and DOE for unidentified or anonymous plaintiffs. However, this is not a strict rule, and there are many instances where ROE and DOE are used intechangeably, DOE to mean defendants and ROE to mean plaintiffs.
In this context, it means "karşı-davalılar". I would translate it as "1 ila 20 numaralı karşı-davalılar"