It shall be unlawful for any person or group of persons willfully and knowingly: (a) to enter or to remain within the capitol building unless such person is authorized by law or by rules of the House or Senate or of the State Budget and Control Board when such entry is done for the purpose of uttering loud, threatening and abusive language or to engage in any disorderly or disruptive conduct with the intent to impede, disrupt or disturb the orderly conduct of any session of the legislature or the orderly conduct within the building or of any hearing before or any deliberation of any committee or subcommittee of the legislature; (b) to obstruct or to impede passage within the capitol grounds or building; (c) to engage in any act of physical violence upon the capitol grounds or within the capitol building; or (d) to parade, demonstrate or picket within the capitol building.