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Wiktionary
ride herd on

vb. (context transitive idiomatic US English) To supervise a group of people, such as workers, and/or their actions, i.e. their work.

WordNet
ride herd on

v. keep tabs on; keep an eye on; keep under surveillance [syn: monitor, supervise]

Usage examples of "ride herd on".

Once that's done, I'll let the technical manager handle sound, and go ride herd on the actors.

I had to virtually ride herd on her constantly to keep her from proudly announcing her son's eminence.

For, Saturday or not, the federal district court down the hall is holding a special hearing, and they asked me to supply a deputy to ride herd on an Indian agent who ought to be ashamed of himself.