In addition to involuntary conscription being slavery, there are also other statements I use as litmus tests for how much a person believes in freedom like,

"Taxation violates property rights and is hence, theft."

"Property right is a human right."

"Property rights are necessary for freedom of speech and expression."

"Not all property titles are valid and just."

"Contracts can only be made with alienable ownership titles."

"Right to life and self-ownership is inalienable and cannot be violated."

"Freedom is not about popularity contests and free stuff. It is about the inviolability of natural rights."

How a person responds to these statements would give me a good idea about whether he is serious about human freedom or just virtue signalling.