It is unlawful for a person to: (a) Knowingly participate in a discriminatory boycott; or (b) Knowingly aid or assist any other person in participating in a discriminatory boycott. However, nothing in this subtitle shall make it unlawful for any person who does not otherwise participate or agree to participate in a 'discriminatory boycott' merely to handle or ship the goods of a person who may be in violation of this subtitle.
Maryland Legal Code