How to Hide SV Media Library Admin Menus

function plt_hide_sv_media_library_menus() {
	//Hide the "straightvisions" menu.
	remove_menu_page('straightvisions');
	//Hide the "straightvisions → Info" menu.
	remove_submenu_page('straightvisions', 'straightvisions');
	//Hide the "straightvisions → SV Media Library" menu.
	remove_submenu_page('straightvisions', 'sv_media_library');
}

add_action('admin_menu', 'plt_hide_sv_media_library_menus', 11);

Where do I put this code?