<prompt> Translate the following text to EnglishSovieti wenyewe waliwafunga wafungwa milioni 1.5 katika kambi zao za kazi za kulazimisha na kuondoa watu waliofanya fujo kwa njia kama vile mauaji ya Katyn, ambapo maofisa wa jeshi 4,500 wa Poland waliuawa kwa ufupi.  <response>: The Soviets themselves imprisoned some 1.5 million Poles in labor camps of their own and eliminated potential troublemakers through actions like the Katyn massacre, in which 4,500 Polish military officers were summarily executed. 