I think you managed to extract only part of the complete phrase. I suspect there is another word: commerce. There are cases that involve interstate commerce. I found a Supreme Court case entitled:
Corn Products Refining Co. v. Eddy, 249 U.S. 427
The second paragraph contains the phrase:
. . . defendants were interfering with plaintiff's interstate commerce and with its lawful business in the state of Kansas, thereby threatening plaintiff with great and irreparable damage . . .
You can read the full case at the related link.
Interstate commerce is commercial trade that takes place between states and over state lines and is regulated by federal law and therefore under federal jurisdiction when there is a lawsuit filed or violation of law.
To refer to two plaintiffs without indicating possession, you would write "two plaintiffs" or "2 plaintiffs." This form does not suggest ownership or possession.
"Plaintiffs' consent" is correct. The apostrophe before the "s" indicates that the consent belongs to multiple plaintiffs.
The correct placement would be "Plaintiffs' Complaint" to indicate that the complaint belongs to multiple plaintiffs.
Pertaining to the mutual relations of States; existing between, or including, different States; as, interstate commerce.
The plural form of plaintiff is plaintiffs.
interstate high way system
the meaning of the phrase myriad manifestation is-countless evidence
Interstate commerce describes the selling and transporting of goods from one state to another.
The plural form of plaintiff is plaintiffs.
Plaintiffs do not have a surrebuttal. They have a rebuttal. Defendants reply is the surreebuttal. Plaintiffs case in chief Defendants case in chief Plaintiffs rebuttal Defendants surrebuttal
That's easy! Its a phrase.
A phrase that is compound. Meaning two or more.