A Member of Congress who receives his certificate of admission, and is seated, allowed to vote, and serve on committees, is _prima facie_ entitled to the seat and salary, even though the House subsequently declares his seat vacant. The one who contested the election and was subsequently chosen to fill the vacancy is entitled to salary only from the time the compensation of such "predecessor" has ceased.[179] PRIVILEGE FROM ARREST This clause is practically obsolete. It applies only to arrests in civil suits, which were still common in this country at the time the Constitution was adopted.[180] It does not apply to service of process in either civil[181] or criminal cases.[182] Nor does it apply to arrest in any criminal case. The phrase "treason, felony or breach of the peace" is interpreted to withdraw all criminal offenses from the operation of the privilege.[183] THE PRIVILEGE OF SPEECH OR DEBATE The protection of this clause is not limited to words spoken in debate, but is applicable to written reports, to resolutions offered, to the act of voting and to all things generally done in a session of the House by one of its members in relation to the business before it.[184] In Kilbourn _v._ Thompson[185] the Supreme Court quoted with approval the following excerpt from the opinion of Chief Justice Parsons in the early Massachusetts of Coffin _v._ Coffin,[186] giving a broad scope to the immunity of legislators: "'These privileges are thus secured, not with the intention of protecting the members against prosecutions for their own benefit, but to support the rights of the people, by enabling their representatives to execute the functions of their office without fear of prosecutions, civil or criminal. I, therefore, think that the article ought not to be construed strictly, but liberally, that the full design of it may be answered. I will not confine it to delivering an opinion, uttering a speech, or haranguing in debate, but will extend it to the giving of a vote, to the making of a written report, and to every other act resulting from the nature and in the execution of the office. And I would define the article as securing to every member exemption from prosecution for everything said or done by him as a representative, in the exercise of the functions of that office, without inquiring whether the exercise was regular, according to the rules of the House, or irregular and against their rules. I do not confine the member to his place in the House; and I am satisfied that there are cases in which he is entitled to this privilege when not within the walls of the representatives' chamber.'"[187] Accordingly the Court ruled that Members of the House of Representatives were not liable to a suit for false imprisonment by reason of their initiation and prosecution of the legislative proceedings under which plaintiff was arrested.[188] Nor does the claim of an unworthy purpose destroy the privilege.