Not only the owner or owners of the land in question shall be guilty of a violation of this chapter if they suffer or permit any of the acts herein prohibited to be done to or upon their lands, but any officers, agents, employees or independent contractors of any landowners who, directly or indirectly, aid or abet such acts or who authorize or direct or supervise such acts or bring in or upon the land or use or operate any truck, bulldozer, shovel or other equipment in performing any of the acts prohibited hereunder shall also be guilty of a violation of this chapter and, upon conviction, shall be subject to the penalties provided herein.