劳改

abbr. for 勞動改造|劳动改造[lao2 dong4 gai3 zao4] / reform through labor / laogai (prison camp)

to toil / labor / laborer / to put sb to trouble (of doing sth) / meritorious deed / to console (Taiwan pr. [lao4] for this sense)

to change / to alter / to transform / to correct

correctional labor camp