No person shall willfully by any means whatever, directly or indirectly, conditionally or unconditionally, obstruct, impede or prevent or attempt or endeavor to obstruct, impede or prevent any person summoned, subpoenaed or called to testify before any grand jury of this state or who may be summoned, subpoenaed or called before any such grand jury from attending or appearing before the same. Nor shall any person, by any means whatever, directly or indirectly, conditionally or unconditionally induce or coerce or attempt or endeavor to induce or coerce any such person to give any false testimony or withhold any true testimony within or before such grand juries.