Thousands of workers of Serbia 's Zastava arms factory entered the second week of protests on Monday over unpaid wages and the lack of a programme to revive the plant 's production .
<response> Thousands of workers of <location>Serbia</location> 's <organization>Zastava</organization> arms factory entered the second week of protests on Monday over unpaid wages and the lack of a programme to revive the plant 's production . </response>