It is unlawful for any person to hinder or interfere with or prevent the Insect Abatement Supervisor or his assistants, or any employees in the Bureau of Insect Control, from performing their duties as herein defined, or knowingly to do or perform any act or thing which will destroy or impair the efficiency of any device or means used by the Bureau of Insect Control for the destruction, prevention, or control of nuisances.