I am reading and translating an article from the Yivo Bletter from May 1931 about Leo Jogiches and it uses the phrase וואַרפֿן די פרײַזן.  It says that a קאָאָפעראַטיוו established that its members could not do this.  How would I translate this? Does it mean to "jack up the price"?

Thanks,
Matthew