An immigrant area, the heavily populated Puente de Vallecas is both residential and commercial and is accessible by underground. It is also one of the poorest areas of Madrid. Entrevías is one of the city’s older districts, and is most known for the parish priests of the San Carlos Borromeo Parish, also known as the iglesia roja, or “Red” Church, because their more liberal methods are considered to diverge from Catholic liturgy. But the priests, all of whom started out as “working priests” under the Franco regime, are popular with the parishioners whom they serve, most of whom are poor and working-class, and have their whole-hearted support.