Petrulis was active in the Lithuanian independence movement from 1899 to 1918; he worked in schools and newspapers, and pressed for the freedom to use the Lithuanian language in the church.
Petrulis aktif dalam gerakan kemerdekaan Lithuania dari 1899 sampai 1918; ia berkarya di sekolah-sekolah dan surat-surat kabar, dan mendorong kebebasan untuk menggunakan bahasa Lithuania di gereja.