Short answer. Yes. Article 150 punishes not only a person who refuses without legal excuse to obey a congressional summons or to testify, but expressly imposes the same penalty on anyone who induces such disobedience or refusal. So a person who induces another to defy a legislative summons can be charged under the same article.
What the law says
The same penalty shall be imposed upon any person who shall induce disobedience to summons or refusal to be sworn by any such body or official.
Revised Penal Code, Article 150 — Disobedience To Legislative Summons. Read the full provision →
The core offense
The power of Congress and similar bodies to summon witnesses would mean little if it could be ignored, so Article 150 of the Revised Penal Code backs it with criminal liability. The article punishes a person who, having been duly summoned to attend as a witness before Congress, its committees, the Constitutional Commissions, or an authorised official, refuses without legal excuse to obey the summons. It also reaches a witness who, though present, refuses to be sworn or affirmed, to answer a legal inquiry, or to produce books, papers, documents, or records required of him in the exercise of those bodies' functions.
The inducer is equally liable
The article does not stop at the person actually summoned. It adds that the same penalty shall be imposed upon any person who shall induce disobedience to summons or refusal to be sworn by any such body or official. This squarely answers the question: someone who persuades, pressures, or otherwise induces a witness to defy a legislative summons, or to refuse to be sworn, commits the offense in his own right and faces the same penalty as the disobedient witness. The law refuses to let the instigator hide behind the person he moved to disobey.
Why inducement is covered
Punishing the inducer protects the integrity of legislative and constitutional inquiries at their most vulnerable point. A witness might be willing to comply until a superior, ally, or interested party talks him out of it; if only the witness could be charged, those pulling the strings would escape while the summoning body is still frustrated. By making the inducer equally liable, Article 150 deters the behind-the-scenes pressure that can defeat an inquiry just as effectively as an open refusal, and it holds responsible the person who caused the defiance.
The penalty and its scope
The offense is punishable by arresto mayor or a fine, or both, with the peso amount of the fine set by Republic Act No. 10951's 2017 revision of the Code's penalties. The article's reach is broad as to the bodies it protects, covering Congress, its committees and subcommittees, and the Constitutional Commissions and their divisions, and broad as to the actors it punishes, covering both the recalcitrant witness and the person who induced the defiance. Anyone tempted to encourage another to ignore a legislative summons should understand that doing so is itself a crime.