Just to give a little bit of insight on what Sora mentioned: Guard channels are specifically-designated frequencies for finding aircraft (and in this case, spacecraft) in distress or that have crashed. To jam on these frequencies would be to require them to be transmitted on continuously, which most air/spacecraft only "listen" for all the time. Two specific frequencies are used by civilians and one is used by military, but jamming on any of them would tell everyone within listening range that something is going on right there, which would be WY's desire to avoid.
Also, Cerberus is an "Earth and Earth-Colonies Only" paramilitary-group. They have developed biological weapons along with having used means of controlling other species for "the sake of the Earth and its colonies" against the whims of the Systems Alliance. So possibly Cerberus could be behind/supporting Weiland-Yutani's actions or they could be attempting to get control of such research from WY.