A possible breakdown of some invariances will be discussed by considering nonlinear spinor theories. The mechanism is similar to the breakdown of the gauge-invariance in the theory of superconductivity. The possibility of the isospin and baryon number nonconservation is discussed in detail. In Sect.1 the basic assumptions are summarized. In Sect.2 the general form of the one- and two-point amplitudes is discussed by broken symmetries. In Sect.3 the parity-symmetrized Heisenberg spinor equation is considered and a relatively simple approximation is developed to calculate some important two- point amplitudes. In addition, this Section contains some considerations about the possibility of the electromagnetic breakdown of the charge symmetry. In Sect.4 the calculations are repeated by introducing a charge-symmetric, but nonisovariant field equation. It will be discussed that the observed approximate isospin conservations may, however, result from the theory, and that a nonisoinvariant, but very-short-range interaction is generated due to the nonisoinvariance of the field equation. In Sect.5 the A-hyperon is discussed by assuming that the A-particle is a consequence of the strong charge asymmetry of the vacuum state. In addition, some speculations are given about the photon amplitude and the possible baryon nonconserving processes. According to the results obtained in this paper the existence of a peculiar interaction («soft» interaction) is predicted. This «soft» interaction is strong, nonisoinvariant, with significant charge asymmetry, short-ranged, characterized by the half of the nucleon Compton wavelenght and vanishes on the light cone.