<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def plugin_get(name):
 """ Return plugin class. @param name: the cms label. """

    plugins = plugins_base_get()
    for plugin in plugins:
        if plugin.Meta.label == name:
            return plugin

    raise RuntimeError('CMS "%s" not known.' % name)