In this question, it is established that the Czechoslovak Legion went back to Europe in 1920 merely on US boats along three different naval roads.
@Felix Goldberg quotes a master's thesis by Major Robert Dziak of the Czech army that says:
Finally, the Czechoslovaks stayed in Russia until 02 SEP 1920 when the last Legionary was evacuated. Totally, 36 transports were dispatched and over 67,700 people were transported through three main directions: First, around Asia, then via Suez Canal to Trieste; Second, across Pacific ocean, Panama canal, Atlantic ocean to Trieste or Hamburg; Third, through Pacific ocean to Canadian West coast, by rail road across Canada, then through Atlantic ocean to Hamburg.
So far, so good. I'm very interested in the next two sentences :
Many passengers were not members of the Legion. The transports took also care of the Legionaries’ family members, civilian personnel, and POWs.
Dziak doesn't explicit further who are those POWs. There is only one additionnal endnote:
In addition, several Russian anti-Bolshevik commanders undertook the travel to Czechoslovakia and became members of the Czechoslovak Armed Forces.
I am a bit skeptical though : why would the Czechoslovak Legion, who didn't plan to play any role anymore in the Russian civil war, bother to bring POWs all around the world to their newly founded homeland, Czechoslovakia ? Why not rather release them, or handle them to the Japanese Army that was occupying Vladivostok ?
Possible explanations that I could imagine :
Maybe some POWs were notabilities and the Czechoslovak Legion expected them to be ransomable when back in Europe ?
Maybe some were adventurers who willingly followed the Czechoslovak Legion, to escape a not-so-bright future in Siberia (where Bolsheviks were clearly winning against the White Russian warlords), and try to build a new life in America or Europe ?
Similarly, maybe prisoners from western Russia might have thought it would be easier to go back home this way rather than crossing war-ravaged Siberia westwards ?
Maybe here POWs doesn't mean POWs captured by the Czechoslovak Legion, but non-Czech, non-Slovak Europeans, captured by the Russian Imperial Army during WWI and released after Brest-Litovsk treaty, who similarly tried to go back to Europe ? Or, as suggested by @Svick in comment, would they be Czechs and Slovaks captured, then released by the Russian Imperial Army, who did not join the Czechoslovak Legion ?
Did the Czechoslovak Legion really bring POWs during its evacuation ?
If yes, who exactly, and how many, were those POWs ? What motivated the Czechoslovak Legion to bring them along ? What happened to them when they reached Czechoslovakia ?
In addition, any more precise figure about how many family members, civilian personnel, and POWs accompanied the Czechoslovak Legion in its evacuation would be appreciated.